diff --git a/leets-mate-java-1 b/leets-mate-java-1
new file mode 160000
index 0000000..b0b5c25
--- /dev/null
+++ b/leets-mate-java-1
@@ -0,0 +1 @@
+Subproject commit b0b5c25eb93b6577e7a6da1b2363b70e17a90714
diff --git a/src/main/java/leets/leets_mate/LeetsMateApplication.java b/src/main/java/leets/leets_mate/LeetsMateApplication.java
index e48ce2b..1ac0f49 100644
--- a/src/main/java/leets/leets_mate/LeetsMateApplication.java
+++ b/src/main/java/leets/leets_mate/LeetsMateApplication.java
@@ -6,33 +6,87 @@ public class LeetsMateApplication {
 
     // 동작 함수입니다.
     public void run() {
+        Scanner scanner=new Scanner(System.in);
+        try{
+            System.out.println("누구누구있어?");
+            String leetsMember=scanner.nextLine();
+            checkHasNoEnglish(leetsMember);
+
+            List<String> membersList=parseMembers((leetsMember));
+
+            System.out.println("몇명씩할래?");
+            int groupNum=scanner.nextInt();
+            checkDataValidity(membersList.size(),groupNum);
+
+            List<List<String>> leetsGroup=generateRandomGroups(membersList,groupNum);
+
+            System.out.println("결과야.");
+            printResult(leetsGroup);
+
+            while(true){
+                System.out.println("마음에 안들어?(y/n)");
+                String answer=scanner.next();
+                if(answer.equalsIgnoreCase("y")){
+                    leetsGroup=generateRandomGroups(membersList,groupNum);
+                    printResult(leetsGroup);
+                }
+                else if(answer.equalsIgnoreCase("n")){
+                    break;
+                }
+            }
+        }catch(IllegalArgumentException e){
+            System.out.println("[ERROR]"+ e.getMessage());
+            run();
+        }finally{
+            scanner.close();
+        }
     }
 
     // 문자열로된 멤버들을 리스트로 분리하는 함수입니다.
     public List<String> parseMembers(String members) {
-        return new ArrayList<>();
+        List<String> memberList=new ArrayList<>();
+        String[] divide=members.split(",");
+        for(String member:divide){
+            memberList.add(member);
+        }
+        return memberList;
     }
 
     // 총 멤버수를 반환합니다.
     public int memberNumber(List<String> members) {
-        return 0;
+        return members.size();
     }
 
     // 멤버 문자열에 영어가 있는지 검사합니다. 영어가 있다면 예외 출력
     public void checkHasNoEnglish(String members) {
+        if(members.matches(".*[a-zA-Z].*")){
+            throw new IllegalArgumentException("영어가 들어가면 안된다.");
+        }
     }
 
     // 멤버수와 최대 짝수 데이터가 유효한지 검사하는 함수입니다. 유효하지 않다면 예외 출력
     public void checkDataValidity(int memberCount, int maximumGroupSize) {
+        if(memberCount<=0||maximumGroupSize<=0||maximumGroupSize>memberCount){
+            throw new IllegalArgumentException(("멤버수와 최대짝수 데이터가 유효하지 않습니다."));
+        }
     }
 
     // 랜덤 짝꿍 추첨하는 함수 입니다.
     public List<List<String>> generateRandomGroups(List<String> memberList, int maximumGroupSize) {
-        return new ArrayList<>();
+        List<String> afterMembers = new ArrayList<>(memberList);
+        Collections.shuffle(afterMembers);
+        List<List<String>> groups = new ArrayList<>();
+        for(int i=0;i<afterMembers.size();i+=maximumGroupSize){
+            groups.add(afterMembers.subList(i,Math.min(i+maximumGroupSize,afterMembers.size())));
+        }
+        return groups;
     }
 
     // 결과를 프린트 하는 함수입니다.
     public void printResult(List<List<String>> result) {
+        for(int i=0;i<result.size();i++){
+            System.out.println(result.get(i));
+        }
     }
 
     public static void main(String[] args) {