diff --git a/youngcch/HelloWorld/.mvn/wrapper/maven-wrapper.jar b/youngcch/HelloWorld/.mvn/wrapper/maven-wrapper.jar
deleted file mode 100644
index cb28b0e..0000000
Binary files a/youngcch/HelloWorld/.mvn/wrapper/maven-wrapper.jar and /dev/null differ
diff --git a/youngcch/HelloWorld/.mvn/wrapper/maven-wrapper.properties b/youngcch/HelloWorld/.mvn/wrapper/maven-wrapper.properties
deleted file mode 100644
index b27a13f..0000000
--- a/youngcch/HelloWorld/.mvn/wrapper/maven-wrapper.properties
+++ /dev/null
@@ -1,2 +0,0 @@
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.2/apache-maven-3.9.2-bin.zip
-wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar
diff --git a/youngcch/HelloWorld/mvnw b/youngcch/HelloWorld/mvnw
deleted file mode 100644
index 66df285..0000000
--- a/youngcch/HelloWorld/mvnw
+++ /dev/null
@@ -1,308 +0,0 @@
-#!/bin/sh
-# ----------------------------------------------------------------------------
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#    https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-# ----------------------------------------------------------------------------
-
-# ----------------------------------------------------------------------------
-# Apache Maven Wrapper startup batch script, version 3.2.0
-#
-# Required ENV vars:
-# ------------------
-#   JAVA_HOME - location of a JDK home dir
-#
-# Optional ENV vars
-# -----------------
-#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
-#     e.g. to debug Maven itself, use
-#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
-#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
-# ----------------------------------------------------------------------------
-
-if [ -z "$MAVEN_SKIP_RC" ] ; then
-
-  if [ -f /usr/local/etc/mavenrc ] ; then
-    . /usr/local/etc/mavenrc
-  fi
-
-  if [ -f /etc/mavenrc ] ; then
-    . /etc/mavenrc
-  fi
-
-  if [ -f "$HOME/.mavenrc" ] ; then
-    . "$HOME/.mavenrc"
-  fi
-
-fi
-
-# OS specific support.  $var _must_ be set to either true or false.
-cygwin=false;
-darwin=false;
-mingw=false
-case "$(uname)" in
-  CYGWIN*) cygwin=true ;;
-  MINGW*) mingw=true;;
-  Darwin*) darwin=true
-    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
-    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
-    if [ -z "$JAVA_HOME" ]; then
-      if [ -x "/usr/libexec/java_home" ]; then
-        JAVA_HOME="$(/usr/libexec/java_home)"; export JAVA_HOME
-      else
-        JAVA_HOME="/Library/Java/Home"; export JAVA_HOME
-      fi
-    fi
-    ;;
-esac
-
-if [ -z "$JAVA_HOME" ] ; then
-  if [ -r /etc/gentoo-release ] ; then
-    JAVA_HOME=$(java-config --jre-home)
-  fi
-fi
-
-# For Cygwin, ensure paths are in UNIX format before anything is touched
-if $cygwin ; then
-  [ -n "$JAVA_HOME" ] &&
-    JAVA_HOME=$(cygpath --unix "$JAVA_HOME")
-  [ -n "$CLASSPATH" ] &&
-    CLASSPATH=$(cygpath --path --unix "$CLASSPATH")
-fi
-
-# For Mingw, ensure paths are in UNIX format before anything is touched
-if $mingw ; then
-  [ -n "$JAVA_HOME" ] && [ -d "$JAVA_HOME" ] &&
-    JAVA_HOME="$(cd "$JAVA_HOME" || (echo "cannot cd into $JAVA_HOME."; exit 1); pwd)"
-fi
-
-if [ -z "$JAVA_HOME" ]; then
-  javaExecutable="$(which javac)"
-  if [ -n "$javaExecutable" ] && ! [ "$(expr "\"$javaExecutable\"" : '\([^ ]*\)')" = "no" ]; then
-    # readlink(1) is not available as standard on Solaris 10.
-    readLink=$(which readlink)
-    if [ ! "$(expr "$readLink" : '\([^ ]*\)')" = "no" ]; then
-      if $darwin ; then
-        javaHome="$(dirname "\"$javaExecutable\"")"
-        javaExecutable="$(cd "\"$javaHome\"" && pwd -P)/javac"
-      else
-        javaExecutable="$(readlink -f "\"$javaExecutable\"")"
-      fi
-      javaHome="$(dirname "\"$javaExecutable\"")"
-      javaHome=$(expr "$javaHome" : '\(.*\)/bin')
-      JAVA_HOME="$javaHome"
-      export JAVA_HOME
-    fi
-  fi
-fi
-
-if [ -z "$JAVACMD" ] ; then
-  if [ -n "$JAVA_HOME"  ] ; then
-    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
-      # IBM's JDK on AIX uses strange locations for the executables
-      JAVACMD="$JAVA_HOME/jre/sh/java"
-    else
-      JAVACMD="$JAVA_HOME/bin/java"
-    fi
-  else
-    JAVACMD="$(\unset -f command 2>/dev/null; \command -v java)"
-  fi
-fi
-
-if [ ! -x "$JAVACMD" ] ; then
-  echo "Error: JAVA_HOME is not defined correctly." >&2
-  echo "  We cannot execute $JAVACMD" >&2
-  exit 1
-fi
-
-if [ -z "$JAVA_HOME" ] ; then
-  echo "Warning: JAVA_HOME environment variable is not set."
-fi
-
-# traverses directory structure from process work directory to filesystem root
-# first directory with .mvn subdirectory is considered project base directory
-find_maven_basedir() {
-  if [ -z "$1" ]
-  then
-    echo "Path not specified to find_maven_basedir"
-    return 1
-  fi
-
-  basedir="$1"
-  wdir="$1"
-  while [ "$wdir" != '/' ] ; do
-    if [ -d "$wdir"/.mvn ] ; then
-      basedir=$wdir
-      break
-    fi
-    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
-    if [ -d "${wdir}" ]; then
-      wdir=$(cd "$wdir/.." || exit 1; pwd)
-    fi
-    # end of workaround
-  done
-  printf '%s' "$(cd "$basedir" || exit 1; pwd)"
-}
-
-# concatenates all lines of a file
-concat_lines() {
-  if [ -f "$1" ]; then
-    # Remove \r in case we run on Windows within Git Bash
-    # and check out the repository with auto CRLF management
-    # enabled. Otherwise, we may read lines that are delimited with
-    # \r\n and produce $'-Xarg\r' rather than -Xarg due to word
-    # splitting rules.
-    tr -s '\r\n' ' ' < "$1"
-  fi
-}
-
-log() {
-  if [ "$MVNW_VERBOSE" = true ]; then
-    printf '%s\n' "$1"
-  fi
-}
-
-BASE_DIR=$(find_maven_basedir "$(dirname "$0")")
-if [ -z "$BASE_DIR" ]; then
-  exit 1;
-fi
-
-MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}; export MAVEN_PROJECTBASEDIR
-log "$MAVEN_PROJECTBASEDIR"
-
-##########################################################################################
-# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
-# This allows using the maven wrapper in projects that prohibit checking in binary data.
-##########################################################################################
-wrapperJarPath="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar"
-if [ -r "$wrapperJarPath" ]; then
-    log "Found $wrapperJarPath"
-else
-    log "Couldn't find $wrapperJarPath, downloading it ..."
-
-    if [ -n "$MVNW_REPOURL" ]; then
-      wrapperUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
-    else
-      wrapperUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
-    fi
-    while IFS="=" read -r key value; do
-      # Remove '\r' from value to allow usage on windows as IFS does not consider '\r' as a separator ( considers space, tab, new line ('\n'), and custom '=' )
-      safeValue=$(echo "$value" | tr -d '\r')
-      case "$key" in (wrapperUrl) wrapperUrl="$safeValue"; break ;;
-      esac
-    done < "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.properties"
-    log "Downloading from: $wrapperUrl"
-
-    if $cygwin; then
-      wrapperJarPath=$(cygpath --path --windows "$wrapperJarPath")
-    fi
-
-    if command -v wget > /dev/null; then
-        log "Found wget ... using wget"
-        [ "$MVNW_VERBOSE" = true ] && QUIET="" || QUIET="--quiet"
-        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
-            wget $QUIET "$wrapperUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
-        else
-            wget $QUIET --http-user="$MVNW_USERNAME" --http-password="$MVNW_PASSWORD" "$wrapperUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
-        fi
-    elif command -v curl > /dev/null; then
-        log "Found curl ... using curl"
-        [ "$MVNW_VERBOSE" = true ] && QUIET="" || QUIET="--silent"
-        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
-            curl $QUIET -o "$wrapperJarPath" "$wrapperUrl" -f -L || rm -f "$wrapperJarPath"
-        else
-            curl $QUIET --user "$MVNW_USERNAME:$MVNW_PASSWORD" -o "$wrapperJarPath" "$wrapperUrl" -f -L || rm -f "$wrapperJarPath"
-        fi
-    else
-        log "Falling back to using Java to download"
-        javaSource="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/MavenWrapperDownloader.java"
-        javaClass="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/MavenWrapperDownloader.class"
-        # For Cygwin, switch paths to Windows format before running javac
-        if $cygwin; then
-          javaSource=$(cygpath --path --windows "$javaSource")
-          javaClass=$(cygpath --path --windows "$javaClass")
-        fi
-        if [ -e "$javaSource" ]; then
-            if [ ! -e "$javaClass" ]; then
-                log " - Compiling MavenWrapperDownloader.java ..."
-                ("$JAVA_HOME/bin/javac" "$javaSource")
-            fi
-            if [ -e "$javaClass" ]; then
-                log " - Running MavenWrapperDownloader.java ..."
-                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$wrapperUrl" "$wrapperJarPath") || rm -f "$wrapperJarPath"
-            fi
-        fi
-    fi
-fi
-##########################################################################################
-# End of extension
-##########################################################################################
-
-# If specified, validate the SHA-256 sum of the Maven wrapper jar file
-wrapperSha256Sum=""
-while IFS="=" read -r key value; do
-  case "$key" in (wrapperSha256Sum) wrapperSha256Sum=$value; break ;;
-  esac
-done < "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.properties"
-if [ -n "$wrapperSha256Sum" ]; then
-  wrapperSha256Result=false
-  if command -v sha256sum > /dev/null; then
-    if echo "$wrapperSha256Sum  $wrapperJarPath" | sha256sum -c > /dev/null 2>&1; then
-      wrapperSha256Result=true
-    fi
-  elif command -v shasum > /dev/null; then
-    if echo "$wrapperSha256Sum  $wrapperJarPath" | shasum -a 256 -c > /dev/null 2>&1; then
-      wrapperSha256Result=true
-    fi
-  else
-    echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available."
-    echo "Please install either command, or disable validation by removing 'wrapperSha256Sum' from your maven-wrapper.properties."
-    exit 1
-  fi
-  if [ $wrapperSha256Result = false ]; then
-    echo "Error: Failed to validate Maven wrapper SHA-256, your Maven wrapper might be compromised." >&2
-    echo "Investigate or delete $wrapperJarPath to attempt a clean download." >&2
-    echo "If you updated your Maven version, you need to update the specified wrapperSha256Sum property." >&2
-    exit 1
-  fi
-fi
-
-MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
-
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin; then
-  [ -n "$JAVA_HOME" ] &&
-    JAVA_HOME=$(cygpath --path --windows "$JAVA_HOME")
-  [ -n "$CLASSPATH" ] &&
-    CLASSPATH=$(cygpath --path --windows "$CLASSPATH")
-  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
-    MAVEN_PROJECTBASEDIR=$(cygpath --path --windows "$MAVEN_PROJECTBASEDIR")
-fi
-
-# Provide a "standardized" way to retrieve the CLI args that will
-# work with both Windows and non-Windows executions.
-MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $*"
-export MAVEN_CMD_LINE_ARGS
-
-WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
-
-# shellcheck disable=SC2086 # safe args
-exec "$JAVACMD" \
-  $MAVEN_OPTS \
-  $MAVEN_DEBUG_OPTS \
-  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
-  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
-  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
diff --git a/youngcch/HelloWorld/mvnw.cmd b/youngcch/HelloWorld/mvnw.cmd
deleted file mode 100644
index 95ba6f5..0000000
--- a/youngcch/HelloWorld/mvnw.cmd
+++ /dev/null
@@ -1,205 +0,0 @@
-@REM ----------------------------------------------------------------------------
-@REM Licensed to the Apache Software Foundation (ASF) under one
-@REM or more contributor license agreements.  See the NOTICE file
-@REM distributed with this work for additional information
-@REM regarding copyright ownership.  The ASF licenses this file
-@REM to you under the Apache License, Version 2.0 (the
-@REM "License"); you may not use this file except in compliance
-@REM with the License.  You may obtain a copy of the License at
-@REM
-@REM    https://www.apache.org/licenses/LICENSE-2.0
-@REM
-@REM Unless required by applicable law or agreed to in writing,
-@REM software distributed under the License is distributed on an
-@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-@REM KIND, either express or implied.  See the License for the
-@REM specific language governing permissions and limitations
-@REM under the License.
-@REM ----------------------------------------------------------------------------
-
-@REM ----------------------------------------------------------------------------
-@REM Apache Maven Wrapper startup batch script, version 3.2.0
-@REM
-@REM Required ENV vars:
-@REM JAVA_HOME - location of a JDK home dir
-@REM
-@REM Optional ENV vars
-@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
-@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
-@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
-@REM     e.g. to debug Maven itself, use
-@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
-@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
-@REM ----------------------------------------------------------------------------
-
-@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
-@echo off
-@REM set title of command window
-title %0
-@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
-@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
-
-@REM set %HOME% to equivalent of $HOME
-if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
-
-@REM Execute a user defined script before this one
-if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
-@REM check for pre script, once with legacy .bat ending and once with .cmd ending
-if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
-if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
-:skipRcPre
-
-@setlocal
-
-set ERROR_CODE=0
-
-@REM To isolate internal variables from possible post scripts, we use another setlocal
-@setlocal
-
-@REM ==== START VALIDATION ====
-if not "%JAVA_HOME%" == "" goto OkJHome
-
-echo.
-echo Error: JAVA_HOME not found in your environment. >&2
-echo Please set the JAVA_HOME variable in your environment to match the >&2
-echo location of your Java installation. >&2
-echo.
-goto error
-
-:OkJHome
-if exist "%JAVA_HOME%\bin\java.exe" goto init
-
-echo.
-echo Error: JAVA_HOME is set to an invalid directory. >&2
-echo JAVA_HOME = "%JAVA_HOME%" >&2
-echo Please set the JAVA_HOME variable in your environment to match the >&2
-echo location of your Java installation. >&2
-echo.
-goto error
-
-@REM ==== END VALIDATION ====
-
-:init
-
-@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
-@REM Fallback to current working directory if not found.
-
-set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
-IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
-
-set EXEC_DIR=%CD%
-set WDIR=%EXEC_DIR%
-:findBaseDir
-IF EXIST "%WDIR%"\.mvn goto baseDirFound
-cd ..
-IF "%WDIR%"=="%CD%" goto baseDirNotFound
-set WDIR=%CD%
-goto findBaseDir
-
-:baseDirFound
-set MAVEN_PROJECTBASEDIR=%WDIR%
-cd "%EXEC_DIR%"
-goto endDetectBaseDir
-
-:baseDirNotFound
-set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
-cd "%EXEC_DIR%"
-
-:endDetectBaseDir
-
-IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
-
-@setlocal EnableExtensions EnableDelayedExpansion
-for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
-@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
-
-:endReadAdditionalConfig
-
-SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
-set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
-set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
-
-set WRAPPER_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
-
-FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
-    IF "%%A"=="wrapperUrl" SET WRAPPER_URL=%%B
-)
-
-@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
-@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
-if exist %WRAPPER_JAR% (
-    if "%MVNW_VERBOSE%" == "true" (
-        echo Found %WRAPPER_JAR%
-    )
-) else (
-    if not "%MVNW_REPOURL%" == "" (
-        SET WRAPPER_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar"
-    )
-    if "%MVNW_VERBOSE%" == "true" (
-        echo Couldn't find %WRAPPER_JAR%, downloading it ...
-        echo Downloading from: %WRAPPER_URL%
-    )
-
-    powershell -Command "&{"^
-		"$webclient = new-object System.Net.WebClient;"^
-		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
-		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
-		"}"^
-		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%WRAPPER_URL%', '%WRAPPER_JAR%')"^
-		"}"
-    if "%MVNW_VERBOSE%" == "true" (
-        echo Finished downloading %WRAPPER_JAR%
-    )
-)
-@REM End of extension
-
-@REM If specified, validate the SHA-256 sum of the Maven wrapper jar file
-SET WRAPPER_SHA_256_SUM=""
-FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
-    IF "%%A"=="wrapperSha256Sum" SET WRAPPER_SHA_256_SUM=%%B
-)
-IF NOT %WRAPPER_SHA_256_SUM%=="" (
-    powershell -Command "&{"^
-       "$hash = (Get-FileHash \"%WRAPPER_JAR%\" -Algorithm SHA256).Hash.ToLower();"^
-       "If('%WRAPPER_SHA_256_SUM%' -ne $hash){"^
-       "  Write-Output 'Error: Failed to validate Maven wrapper SHA-256, your Maven wrapper might be compromised.';"^
-       "  Write-Output 'Investigate or delete %WRAPPER_JAR% to attempt a clean download.';"^
-       "  Write-Output 'If you updated your Maven version, you need to update the specified wrapperSha256Sum property.';"^
-       "  exit 1;"^
-       "}"^
-       "}"
-    if ERRORLEVEL 1 goto error
-)
-
-@REM Provide a "standardized" way to retrieve the CLI args that will
-@REM work with both Windows and non-Windows executions.
-set MAVEN_CMD_LINE_ARGS=%*
-
-%MAVEN_JAVA_EXE% ^
-  %JVM_CONFIG_MAVEN_PROPS% ^
-  %MAVEN_OPTS% ^
-  %MAVEN_DEBUG_OPTS% ^
-  -classpath %WRAPPER_JAR% ^
-  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
-  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
-if ERRORLEVEL 1 goto error
-goto end
-
-:error
-set ERROR_CODE=1
-
-:end
-@endlocal & set ERROR_CODE=%ERROR_CODE%
-
-if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
-@REM check for post script, once with legacy .bat ending and once with .cmd ending
-if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
-if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
-:skipRcPost
-
-@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
-if "%MAVEN_BATCH_PAUSE%"=="on" pause
-
-if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
-
-cmd /C exit /B %ERROR_CODE%
diff --git a/youngcch/HelloWorld/pom.xml b/youngcch/HelloWorld/pom.xml
deleted file mode 100644
index acc4d28..0000000
--- a/youngcch/HelloWorld/pom.xml
+++ /dev/null
@@ -1,59 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
-	<parent>
-		<groupId>org.springframework.boot</groupId>
-		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.1.1</version>
-		<relativePath/> <!-- lookup parent from repository -->
-	</parent>
-	<groupId>com.example</groupId>
-	<artifactId>HelloWorld</artifactId>
-	<version>0.0.1-SNAPSHOT</version>
-	<name>HelloWorld</name>
-	<description>Demo project for Spring Boot</description>
-	<properties>
-		<java.version>17</java.version>
-	</properties>
-	<dependencies>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-web</artifactId>
-		</dependency>
-
-		<dependency>
-			<groupId>org.projectlombok</groupId>
-			<artifactId>lombok</artifactId>
-			<optional>true</optional>
-		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-test</artifactId>
-			<scope>test</scope>
-		</dependency>
-		<dependency>
-        	<groupId>org.json</groupId>
-        	<artifactId>json</artifactId>
-        	<version>20210307</version>
-  		</dependency>
-	</dependencies>
-
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.springframework.boot</groupId>
-				<artifactId>spring-boot-maven-plugin</artifactId>
-				<configuration>
-					<excludes>
-						<exclude>
-							<groupId>org.projectlombok</groupId>
-							<artifactId>lombok</artifactId>
-						</exclude>
-					</excludes>
-				</configuration>
-			</plugin>
-		</plugins>
-	</build>
-
-</project>
diff --git a/youngcch/HelloWorld/src/main/java/com/example/demo/HelloWorldApplication.java b/youngcch/HelloWorld/src/main/java/com/example/demo/HelloWorldApplication.java
deleted file mode 100644
index fe663fb..0000000
--- a/youngcch/HelloWorld/src/main/java/com/example/demo/HelloWorldApplication.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.example.demo;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-@SpringBootApplication
-public class HelloWorldApplication {
-
-	public static void main(String[] args) {
-		SpringApplication.run(HelloWorldApplication.class, args);
-	}
-
-}
diff --git a/youngcch/HelloWorld/src/main/java/com/example/demo/controller/HelloController.java b/youngcch/HelloWorld/src/main/java/com/example/demo/controller/HelloController.java
deleted file mode 100644
index 9eeffd3..0000000
--- a/youngcch/HelloWorld/src/main/java/com/example/demo/controller/HelloController.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.example.demo.controller;
-
-import org.json.JSONObject;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-public class HelloController {
-
-	@RequestMapping("/")
-	public String helloWorld() {
-		return "Hello World";
-	}
-	
-	@RequestMapping("/api/test")
-	public String api() {
-		return "{ \"test\" : \"api test success\" }";
-	}
-	
-	@RequestMapping("/api/testkey")
-	public String bonus(@RequestParam("key") String key) {
-		try {
-            int value = Integer.parseInt(key);
-            JSONObject json = new JSONObject();
-            json.put("key", value);
-            return json.toString();
-        } catch (Exception e1) {
-            return "Error";
-        }
-	}
-}
-
diff --git a/youngcch/HelloWorld/src/main/resources/application.properties b/youngcch/HelloWorld/src/main/resources/application.properties
deleted file mode 100644
index 8b13789..0000000
--- a/youngcch/HelloWorld/src/main/resources/application.properties
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/youngcch/HelloWorld/.gitignore b/youngcch/LoginProject/.gitignore
similarity index 69%
rename from youngcch/HelloWorld/.gitignore
rename to youngcch/LoginProject/.gitignore
index 549e00a..c2065bc 100644
--- a/youngcch/HelloWorld/.gitignore
+++ b/youngcch/LoginProject/.gitignore
@@ -1,8 +1,9 @@
 HELP.md
-target/
-!.mvn/wrapper/maven-wrapper.jar
-!**/src/main/**/target/
-!**/src/test/**/target/
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
 
 ### STS ###
 .apt_generated
@@ -12,12 +13,18 @@ target/
 .settings
 .springBeans
 .sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
 
 ### IntelliJ IDEA ###
 .idea
 *.iws
 *.iml
 *.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
 
 ### NetBeans ###
 /nbproject/private/
@@ -25,9 +32,6 @@ target/
 /dist/
 /nbdist/
 /.nb-gradle/
-build/
-!**/src/main/**/build/
-!**/src/test/**/build/
 
 ### VS Code ###
 .vscode/
diff --git a/youngcch/LoginProject/build.gradle b/youngcch/LoginProject/build.gradle
new file mode 100644
index 0000000..e20dd7a
--- /dev/null
+++ b/youngcch/LoginProject/build.gradle
@@ -0,0 +1,38 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.1.1'
+	id 'io.spring.dependency-management' version '1.1.0'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	sourceCompatibility = '17'
+}
+
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'org.springframework.boot:spring-boot-starter-security'
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf:3.0.4'
+	compileOnly 'org.projectlombok:lombok'
+	runtimeOnly 'org.mariadb.jdbc:mariadb-java-client'
+	annotationProcessor 'org.projectlombok:lombok'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testImplementation 'org.springframework.security:spring-security-test'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}
diff --git a/youngcch/LoginProject/gradle/wrapper/gradle-wrapper.jar b/youngcch/LoginProject/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..c1962a7
Binary files /dev/null and b/youngcch/LoginProject/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/youngcch/LoginProject/gradle/wrapper/gradle-wrapper.properties b/youngcch/LoginProject/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..37aef8d
--- /dev/null
+++ b/youngcch/LoginProject/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+networkTimeout=10000
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/youngcch/LoginProject/gradlew b/youngcch/LoginProject/gradlew
new file mode 100644
index 0000000..aeb74cb
--- /dev/null
+++ b/youngcch/LoginProject/gradlew
@@ -0,0 +1,245 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/youngcch/LoginProject/gradlew.bat b/youngcch/LoginProject/gradlew.bat
new file mode 100644
index 0000000..93e3f59
--- /dev/null
+++ b/youngcch/LoginProject/gradlew.bat
@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/youngcch/LoginProject/settings.gradle b/youngcch/LoginProject/settings.gradle
new file mode 100644
index 0000000..f2ee6ce
--- /dev/null
+++ b/youngcch/LoginProject/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'LoginProject'
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/LoginProjectApplication.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/LoginProjectApplication.java
new file mode 100644
index 0000000..2e1bfae
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/LoginProjectApplication.java
@@ -0,0 +1,14 @@
+package com.example.LoginProject;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
+
+@SpringBootApplication(exclude = {SecurityAutoConfiguration.class})
+public class LoginProjectApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(LoginProjectApplication.class, args);
+	}
+
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/Repository/UserRepository.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/Repository/UserRepository.java
new file mode 100644
index 0000000..65204a3
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/Repository/UserRepository.java
@@ -0,0 +1,10 @@
+package com.example.LoginProject.Repository;
+
+import com.example.LoginProject.model.UserEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<UserEntity, Long> {
+    UserEntity findByUsername(String username);
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/config/WebSecurityConfig.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/config/WebSecurityConfig.java
new file mode 100644
index 0000000..7dd95f8
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/config/WebSecurityConfig.java
@@ -0,0 +1,14 @@
+package com.example.LoginProject.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+@Configuration
+public class WebSecurityConfig {
+    @Bean
+    public PasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/controller/UserController.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/controller/UserController.java
new file mode 100644
index 0000000..c06f206
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/controller/UserController.java
@@ -0,0 +1,54 @@
+package com.example.LoginProject.controller;
+
+import com.example.LoginProject.model.UserDto;
+import org.springframework.ui.Model;
+import com.example.LoginProject.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@Controller
+public class UserController {
+    private UserService userService;
+
+    @Autowired
+    public UserController(UserService userService) {
+        this.userService = userService;
+    }
+
+    @GetMapping("/login")
+    public String showLoginPage() {
+        return "loginpage";
+    }
+
+    @PostMapping("/login")
+    public String login(@RequestParam String username, @RequestParam String password,@RequestParam Long id, Model model) {
+        UserDto userDto = new UserDto(username, password, id);
+        if (userService.login(userDto)) {
+            model.addAttribute("username", username);
+            return "login-success";
+        } else {
+            model.addAttribute("error", "Invalid username or password.");
+            return "loginpage";
+        }
+    }
+
+    @GetMapping("/signup")
+    public String showRegisterPage() {
+        return "signup";
+    }
+
+    @PostMapping("/signup")
+    public String register(@RequestParam String username, @RequestParam String password, @RequestParam Long id, Model model) {
+        UserDto userDto = new UserDto(username, password, id);
+        if (userService.register(userDto)) {
+            model.addAttribute("username", username);
+            return "register-success";
+        } else {
+            model.addAttribute("error", "Username already exists.");
+            return "signup";
+        }
+    }
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/model/UserDto.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/model/UserDto.java
new file mode 100644
index 0000000..b74e2ce
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/model/UserDto.java
@@ -0,0 +1,42 @@
+package com.example.LoginProject.model;
+
+public class UserDto {
+    private Long id;
+    private String username;
+    private String password;
+
+    public UserDto() {
+    }
+
+    public UserDto(String username, String password, Long id) {
+        this.username = username;
+        this.password = password;
+        this.id = id;
+    }
+    public UserDto(String username, String password) {
+        this.username = username;
+        this.password = password;
+    }
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/model/UserEntity.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/model/UserEntity.java
new file mode 100644
index 0000000..1e6defc
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/model/UserEntity.java
@@ -0,0 +1,46 @@
+package com.example.LoginProject.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Table;
+import org.springframework.data.annotation.Id;
+
+@Entity
+@Table(name = "user")
+public class UserEntity {
+    @jakarta.persistence.Id
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String username;
+    private String password;
+
+    private boolean enabled;
+
+    public Long getId(){
+        return id;
+    }
+    public void setId(Long id){
+        this.id = id;
+    }
+    public String getUsername(){
+        return username;
+    }
+    public void setUsername(String username){
+        this.username = username;
+    }
+    public String getPassword(){
+        return password;
+    }
+    public void setPassword(String password){
+        this.password = password;
+    }
+    public boolean isEnabled() {
+        return enabled;
+    }
+    public void setEnabled(boolean enabled){
+        this.enabled = enabled;
+    }
+
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/service/PasswordEncryptor.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/service/PasswordEncryptor.java
new file mode 100644
index 0000000..8be7378
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/service/PasswordEncryptor.java
@@ -0,0 +1,11 @@
+package com.example.LoginProject.service;
+
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+public class PasswordEncryptor {
+    public static String encryptPassword(String password) {
+        PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
+        return passwordEncoder.encode(password);
+    }
+}
diff --git a/youngcch/LoginProject/src/main/java/com/example/LoginProject/service/UserService.java b/youngcch/LoginProject/src/main/java/com/example/LoginProject/service/UserService.java
new file mode 100644
index 0000000..f11cc74
--- /dev/null
+++ b/youngcch/LoginProject/src/main/java/com/example/LoginProject/service/UserService.java
@@ -0,0 +1,41 @@
+package com.example.LoginProject.service;
+
+import com.example.LoginProject.Repository.UserRepository;
+import com.example.LoginProject.model.UserDto;
+import com.example.LoginProject.model.UserEntity;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+    private UserRepository userRepository;
+
+    @Autowired
+    public UserService(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    public boolean register(UserDto userDto) {
+        if (userRepository.findByUsername(userDto.getUsername()) != null) {
+            return false; // 이미 존재하는 사용자
+        }
+
+        String encryptedPassword = PasswordEncryptor.encryptPassword(userDto.getPassword());
+        UserEntity userEntity = new UserEntity();
+        userEntity.setUsername(userDto.getUsername());
+        userEntity.setPassword(encryptedPassword);
+        userRepository.save(userEntity);
+        return true;
+    }
+
+    public boolean login(UserDto userDto) {
+        UserEntity userEntity = userRepository.findByUsername(userDto.getUsername());
+        if (userEntity != null) {
+            PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
+            return passwordEncoder.matches(userDto.getPassword(), userEntity.getPassword());
+        }
+        return false;
+    }
+}
diff --git a/youngcch/LoginProject/src/main/resources/application.properties b/youngcch/LoginProject/src/main/resources/application.properties
new file mode 100644
index 0000000..8aaa099
--- /dev/null
+++ b/youngcch/LoginProject/src/main/resources/application.properties
@@ -0,0 +1,4 @@
+spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
+spring.datasource.url=jdbc:mariadb://localhost:3306/test1
+spring.datasource.username=root
+spring.datasource.password=cyc
\ No newline at end of file
diff --git a/youngcch/LoginProject/src/main/resources/templates/login-success.html b/youngcch/LoginProject/src/main/resources/templates/login-success.html
new file mode 100644
index 0000000..2175248
--- /dev/null
+++ b/youngcch/LoginProject/src/main/resources/templates/login-success.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Login Success</title>
+</head>
+<body>
+<h2>Login Success!</h2>
+<p>Welcome, <span th:text="${username}"></span>!</p>
+</body>
+</html>
diff --git a/youngcch/LoginProject/src/main/resources/templates/loginpage.html b/youngcch/LoginProject/src/main/resources/templates/loginpage.html
new file mode 100644
index 0000000..aa9db8a
--- /dev/null
+++ b/youngcch/LoginProject/src/main/resources/templates/loginpage.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title>로그인</title>
+</head>
+<body>
+<h2>로그인</h2>
+<form action="/login" method="post">
+    <div>
+        <label for="username">사용자명:</label>
+        <input type="text" id="username" name="username" required placeholder="사용자명">
+    </div>
+    <div>
+        <label for="password">비밀번호:</label>
+        <input type="password" id="password" name="password" required placeholder="비밀번호">
+    </div>
+    <div>
+        <input type="submit" value="로그인">
+    </div>
+</form>
+<p>
+    계정이 없으신가요? <a href="/signup">회원 가입</a>
+</p>
+</body>
+</html>
diff --git a/youngcch/LoginProject/src/main/resources/templates/register-success.html b/youngcch/LoginProject/src/main/resources/templates/register-success.html
new file mode 100644
index 0000000..aa39c5e
--- /dev/null
+++ b/youngcch/LoginProject/src/main/resources/templates/register-success.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Register Success</title>
+</head>
+<body>
+<h2>Registration Successful!</h2>
+<p>Congratulations, <span th:text="${username}"></span>! You have successfully registered.</p>
+</body>
+</html>
diff --git a/youngcch/LoginProject/src/main/resources/templates/signup.html b/youngcch/LoginProject/src/main/resources/templates/signup.html
new file mode 100644
index 0000000..de1f142
--- /dev/null
+++ b/youngcch/LoginProject/src/main/resources/templates/signup.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title>Signup</title>
+</head>
+<body>
+<h2>Signup</h2>
+<form action="/signup" method="post">
+    <div>
+        <label for="username">Username:</label>
+        <input type="text" id="username" name="username" required>
+    </div>
+    <div>
+        <label for="password">Password:</label>
+        <input type="password" id="password" name="password" required>
+    </div>
+    <div>
+        <input type="submit" value="Signup">
+    </div>
+</form>
+</body>
+</html>
diff --git a/youngcch/HelloWorld/src/test/java/com/example/demo/HelloWorldApplicationTests.java b/youngcch/LoginProject/src/test/java/com/example/LoginProject/LoginProjectApplicationTests.java
similarity index 68%
rename from youngcch/HelloWorld/src/test/java/com/example/demo/HelloWorldApplicationTests.java
rename to youngcch/LoginProject/src/test/java/com/example/LoginProject/LoginProjectApplicationTests.java
index 7945f19..e36d571 100644
--- a/youngcch/HelloWorld/src/test/java/com/example/demo/HelloWorldApplicationTests.java
+++ b/youngcch/LoginProject/src/test/java/com/example/LoginProject/LoginProjectApplicationTests.java
@@ -1,10 +1,10 @@
-package com.example.demo;
+package com.example.LoginProject;
 
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest
-class HelloWorldApplicationTests {
+class LoginProjectApplicationTests {
 
 	@Test
 	void contextLoads() {