diff --git a/backend/src/main/java/org/sejongisc/backend/board/dto/CommentResponse.java b/backend/src/main/java/org/sejongisc/backend/board/dto/CommentResponse.java
index eb2a7879..a3f9e4c5 100644
--- a/backend/src/main/java/org/sejongisc/backend/board/dto/CommentResponse.java
+++ b/backend/src/main/java/org/sejongisc/backend/board/dto/CommentResponse.java
@@ -25,9 +25,14 @@ public class CommentResponse {
     private String content;
     private LocalDateTime createdDate;
     private LocalDateTime updatedDate;
+    private UUID parentCommentId;
     private List<CommentResponse> replies;
 
   public static CommentResponse from(Comment comment) {
+    UUID parentId = (comment.getParentComment() != null)
+        ? comment.getParentComment().getCommentId()
+        : null;
+
     return CommentResponse.builder()
         .commentId(comment.getCommentId())
         .user(UserInfoResponse.from(comment.getUser()))
@@ -35,10 +40,15 @@ public static CommentResponse from(Comment comment) {
         .content(comment.getContent())
         .createdDate(comment.getCreatedDate())
         .updatedDate(comment.getUpdatedDate())
+        .parentCommentId(parentId)
         .build();
   }
 
   public static CommentResponse from(Comment comment, List<CommentResponse> replies) {
+    UUID parentCommentId = (comment.getParentComment() != null)
+        ? comment.getParentComment().getCommentId()
+        : null;
+
     return CommentResponse.builder()
         .commentId(comment.getCommentId())
         .user(UserInfoResponse.from(comment.getUser()))
@@ -46,6 +56,7 @@ public static CommentResponse from(Comment comment, List<CommentResponse> replie
         .content(comment.getContent())
         .createdDate(comment.getCreatedDate())
         .updatedDate(comment.getUpdatedDate())
+        .parentCommentId(parentCommentId)
         .replies(replies)
         .build();
   }
diff --git a/backend/src/main/java/org/sejongisc/backend/board/service/PostServiceImpl.java b/backend/src/main/java/org/sejongisc/backend/board/service/PostServiceImpl.java
index 958372f4..1e90384c 100644
--- a/backend/src/main/java/org/sejongisc/backend/board/service/PostServiceImpl.java
+++ b/backend/src/main/java/org/sejongisc/backend/board/service/PostServiceImpl.java
@@ -265,9 +265,13 @@ public PostResponse getPostDetail(UUID postId, UUID userId, int pageNumber, int
 
     // 부모 댓글을 CommentResponse DTO로 변환
     Page<CommentResponse> commentResponses = parentComments.map(parent -> {
+
       // 해당 부모 댓글의 자식 댓글 목록을 조회
       List<Comment> childComments = commentRepository.findByParentComment(parent);
 
+      // 부모 객체 연결
+      childComments.forEach(child -> child.setParentComment(parent));
+
       // 자식 댓글 목록을 CommentResponse DTO 리스트로 변환
       List<CommentResponse> replyResponses = childComments.stream()
           .map(CommentResponse::from)