diff --git a/src/main/java/hamsung/hamsung_project/entity/Comment.java b/src/main/java/hamsung/hamsung_project/entity/Comment.java
index 90c67ee..6ae93be 100644
--- a/src/main/java/hamsung/hamsung_project/entity/Comment.java
+++ b/src/main/java/hamsung/hamsung_project/entity/Comment.java
@@ -2,6 +2,8 @@
 
 import jakarta.persistence.*;
 import lombok.*;
+import org.hibernate.annotations.OnDelete;
+import org.hibernate.annotations.OnDeleteAction;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -30,8 +32,9 @@ public class Comment {
     @OneToMany(mappedBy = "comment", cascade = CascadeType.REMOVE, orphanRemoval = true)
     private List<ChildComment> childs = new ArrayList<>();
 
-    @ManyToOne
+    @ManyToOne(fetch=FetchType.LAZY)
     @JoinColumn(name ="recruit_id")
+    @OnDelete(action= OnDeleteAction.CASCADE)
     private Recruit recruit; //스터디 모집글
 
     public static Comment createComment(Long id, String text, String createdDate, String modifiedDate) {
diff --git a/src/main/java/hamsung/hamsung_project/entity/Recruit.java b/src/main/java/hamsung/hamsung_project/entity/Recruit.java
index 1eff63a..c36c1d7 100644
--- a/src/main/java/hamsung/hamsung_project/entity/Recruit.java
+++ b/src/main/java/hamsung/hamsung_project/entity/Recruit.java
@@ -35,7 +35,7 @@ public class Recruit {
 
 
     @JoinColumn(name="study_id")
-    @JsonBackReference
+//    @JsonBackReference
     @OneToOne(cascade = CascadeType.ALL)
     private Study study;
 
diff --git a/src/main/java/hamsung/hamsung_project/entity/StudyMember.java b/src/main/java/hamsung/hamsung_project/entity/StudyMember.java
index 2f77968..765bfa5 100644
--- a/src/main/java/hamsung/hamsung_project/entity/StudyMember.java
+++ b/src/main/java/hamsung/hamsung_project/entity/StudyMember.java
@@ -1,5 +1,6 @@
 package hamsung.hamsung_project.entity;
 
+import com.fasterxml.jackson.annotation.JsonBackReference;
 import jakarta.persistence.*;
 import lombok.*;
 import org.hibernate.annotations.ColumnDefault;
@@ -30,6 +31,7 @@ public class StudyMember {
     private User users;
 
     @ManyToOne
+    @JsonBackReference
     @JoinColumn(name="study_id")
     private Study study;
 
diff --git a/src/main/java/hamsung/hamsung_project/service/RecruitsService.java b/src/main/java/hamsung/hamsung_project/service/RecruitsService.java
index 533c31d..a32746c 100644
--- a/src/main/java/hamsung/hamsung_project/service/RecruitsService.java
+++ b/src/main/java/hamsung/hamsung_project/service/RecruitsService.java
@@ -2,6 +2,7 @@
 
 import hamsung.hamsung_project.dto.*;
 import hamsung.hamsung_project.entity.*;
+import hamsung.hamsung_project.exception.InvalidDataException;
 import hamsung.hamsung_project.repository.*;
 import hamsung.hamsung_project.repository.RecruitsRepository;
 import hamsung.hamsung_project.repository.StudyMemberRepository;
@@ -28,6 +29,7 @@ public class RecruitsService {
     private final UserRepository userRepository;
     private final StudyMemberService studyMemberService;
     private final CommentRepository commentRepository;
+    private final ChildCommentRepository childCommentRepository;
 
     //게시글 생성 //스터디 생성
     @Transactional
@@ -108,13 +110,15 @@ public boolean deleteRecruit(Long id){
         Recruit target=recruitsRepository.findById(id).orElseThrow(()->new IllegalArgumentException("해당 게시글을 찾을 수 없습니다."));
         if (recruitsRepository.existsById(id)) {
             //FK 연관관계 때문에 게시글에 딸린 comments 먼저 삭제.
-            List<Comment> comment=commentRepository.findAllByRecruitId(id);
-            commentRepository.deleteAll(comment);
+//            List<Comment> comment=commentRepository.findAllByRecruitId(id);
+//            commentRepository.deleteAll(comment);
+
             recruitsRepository.deleteById(id);
             return true;
         } else {
             return false;
         }
+
     }
 
     //스터디 모집 상태 변경(버튼 클릭?)