diff --git a/src/main/java/com/inglo/giggle/career/application/dto/response/ReadGuestsCareersOverviewsResponseDto.java b/src/main/java/com/inglo/giggle/career/application/dto/response/ReadGuestsCareersOverviewsResponseDto.java
index df24f51..8d73346 100644
--- a/src/main/java/com/inglo/giggle/career/application/dto/response/ReadGuestsCareersOverviewsResponseDto.java
+++ b/src/main/java/com/inglo/giggle/career/application/dto/response/ReadGuestsCareersOverviewsResponseDto.java
@@ -58,7 +58,7 @@ public static class CareerOverviewDto {
 
         @NotNull
         @JsonProperty("left_days")
-        private final String leftDays;
+        private final int leftDays;
 
         @NotNull
         @JsonProperty("status")
@@ -84,7 +84,7 @@ public CareerOverviewDto(
                 List<EVisa> visa,
                 String hostName,
                 String organizerName,
-                String leftDays,
+                int leftDays,
                 ERecruitmentStatus status,
                 String recruitmentStartDate,
                 String recruitmentEndDate,
diff --git a/src/main/java/com/inglo/giggle/career/application/dto/response/ReadUsersCareersOverviewsResponseDto.java b/src/main/java/com/inglo/giggle/career/application/dto/response/ReadUsersCareersOverviewsResponseDto.java
index 47e046a..f1b5428 100644
--- a/src/main/java/com/inglo/giggle/career/application/dto/response/ReadUsersCareersOverviewsResponseDto.java
+++ b/src/main/java/com/inglo/giggle/career/application/dto/response/ReadUsersCareersOverviewsResponseDto.java
@@ -61,7 +61,7 @@ public static class CareerOverviewDto {
 
         @NotNull
         @JsonProperty("left_days")
-        private final String leftDays;
+        private final int leftDays;
 
         @NotNull
         @JsonProperty("status")
@@ -88,7 +88,7 @@ public CareerOverviewDto(
                 List<EVisa> visa,
                 String hostName,
                 String organizerName,
-                String leftDays,
+                int leftDays,
                 ERecruitmentStatus status,
                 String recruitmentStartDate,
                 String recruitmentEndDate,
diff --git a/src/main/java/com/inglo/giggle/career/application/service/ReadGuestCareersOverviewsService.java b/src/main/java/com/inglo/giggle/career/application/service/ReadGuestCareersOverviewsService.java
index bcfbd0e..f8f1d5c 100644
--- a/src/main/java/com/inglo/giggle/career/application/service/ReadGuestCareersOverviewsService.java
+++ b/src/main/java/com/inglo/giggle/career/application/service/ReadGuestCareersOverviewsService.java
@@ -29,8 +29,6 @@ public class ReadGuestCareersOverviewsService implements ReadGuestCareersOvervie
     // 최신순
     private static final String RECENT = "RECENT";
 
-    private static final String END = "end";
-
     private final CareerRepository careerRepository;
 
     @Override
@@ -87,19 +85,19 @@ private ReadGuestsCareersOverviewsResponseDto.CareerOverviewDto toDto(Career car
                 .build();
     }
 
-    private String calculateLeftDays(LocalDate startDate, LocalDate endDate) {
+    private int calculateLeftDays(LocalDate startDate, LocalDate endDate) {
         LocalDate today = LocalDate.now();
-        Long days;
+
         if (today.isBefore(startDate)) {
-            days = ChronoUnit.DAYS.between(LocalDate.now(), startDate);
-        }
-        else if (today.isEqual(startDate) || today.isAfter(startDate)) {
-            days = ChronoUnit.DAYS.between(LocalDate.now(), endDate);
-        }
-        else {
-            days = null;
+            // 아직 시작 전 → 시작일까지 남은 날짜
+            return (int) ChronoUnit.DAYS.between(today, startDate);
+        } else if (!today.isAfter(endDate)) {
+            // 시작일 이상이고 종료일 이하 → 종료일까지 남은 날짜
+            return (int) ChronoUnit.DAYS.between(today, endDate);
+        } else {
+            // 종료일 이후 → 이미 지난 기간 (음수로 반환)
+            return (int) ChronoUnit.DAYS.between(endDate, today) * -1;
         }
-        return days != null ? days + " days left" : END;
     }
 
     private ERecruitmentStatus calculateRecruitmentStatus(LocalDate start, LocalDate end) {
diff --git a/src/main/java/com/inglo/giggle/career/application/service/ReadUserCareersOverviewsService.java b/src/main/java/com/inglo/giggle/career/application/service/ReadUserCareersOverviewsService.java
index b1eb3e6..eeff3c3 100644
--- a/src/main/java/com/inglo/giggle/career/application/service/ReadUserCareersOverviewsService.java
+++ b/src/main/java/com/inglo/giggle/career/application/service/ReadUserCareersOverviewsService.java
@@ -31,8 +31,6 @@ public class ReadUserCareersOverviewsService implements ReadUsersCareersOverview
     // 최신순
     private static final String RECENT = "RECENT";
 
-    private static final String END = "end";
-
     private final CareerRepository careerRepository;
     private final BookMarkCareerRepository bookMarkCareerRepository;
 
@@ -128,17 +126,19 @@ private ReadUsersCareersOverviewsResponseDto.CareerOverviewDto toDto(Career care
                 .build();
     }
 
-    private String calculateLeftDays(LocalDate startDate, LocalDate endDate) {
+    private int calculateLeftDays(LocalDate startDate, LocalDate endDate) {
         LocalDate today = LocalDate.now();
-        Long days;
+
         if (today.isBefore(startDate)) {
-            days = ChronoUnit.DAYS.between(LocalDate.now(), startDate);
-        } else if (today.isEqual(startDate) || today.isAfter(startDate)) {
-            days = ChronoUnit.DAYS.between(LocalDate.now(), endDate);
+            // 아직 시작 전 → 시작일까지 남은 날짜
+            return (int) ChronoUnit.DAYS.between(today, startDate);
+        } else if (!today.isAfter(endDate)) {
+            // 시작일 이상이고 종료일 이하 → 종료일까지 남은 날짜
+            return (int) ChronoUnit.DAYS.between(today, endDate);
         } else {
-            days = null;
+            // 종료일 이후 → 이미 지난 기간 (음수로 반환)
+            return (int) ChronoUnit.DAYS.between(endDate, today) * -1;
         }
-        return days != null ? days + " days left" : END;
     }
 
     private ERecruitmentStatus calculateRecruitmentStatus(LocalDate start, LocalDate end) {