diff --git a/backend/src/main/java/aimo/backend/domains/comment/controller/ParentCommentController.java b/backend/src/main/java/aimo/backend/domains/comment/controller/ParentCommentController.java
index b1f3de7..c7a5710 100644
--- a/backend/src/main/java/aimo/backend/domains/comment/controller/ParentCommentController.java
+++ b/backend/src/main/java/aimo/backend/domains/comment/controller/ParentCommentController.java
@@ -30,10 +30,11 @@ public class ParentCommentController {
 	@PostMapping("/{postId}/comments")
 	public ResponseEntity<DataResponse<Void>> saveParentComment(
 		@Valid @PathVariable Long postId,
-		@Valid @RequestBody SaveParentCommentRequest request) {
+		@Valid @RequestBody SaveParentCommentRequest request
+	) {
 		Long memberId = MemberLoader.getMemberId();
-		SaveParentCommentParameter parameter =
-			SaveParentCommentParameter.of(memberId, postId, request.content());
+
+		SaveParentCommentParameter parameter = SaveParentCommentParameter.of(memberId, postId, request.content());
 		parentCommentMemberService.saveParentComment(parameter);
 
 		return ResponseEntity.ok(DataResponse.ok());
@@ -42,10 +43,15 @@ public ResponseEntity<DataResponse<Void>> saveParentComment(
 	@PutMapping("comments/{commentId}")
 	public ResponseEntity<DataResponse<Void>> updateParentComment(
 		@Valid @PathVariable Long commentId,
-		@Valid @RequestBody UpdateParentCommentRequest request) {
+		@Valid @RequestBody UpdateParentCommentRequest request
+	) {
 		Long memberId = MemberLoader.getMemberId();
-		UpdateParentCommentParameter parameter =
-			UpdateParentCommentParameter.of(memberId, commentId, request.content());
+
+		UpdateParentCommentParameter parameter = UpdateParentCommentParameter.of(
+			memberId,
+			commentId,
+			request.content());
+
 		parentCommentMemberService.validateAndUpdateParentComment(parameter);
 
 		return ResponseEntity.ok(DataResponse.ok());
@@ -56,7 +62,9 @@ public ResponseEntity<DataResponse<Void>> deleteParentComment(
 		@Valid @PathVariable("commentId") Long commentId
 	) {
 		Long memberId = MemberLoader.getMemberId();
+
 		DeleteParentCommentParameter parameter = DeleteParentCommentParameter.of(memberId, commentId);
+
 		parentCommentMemberService.validateAndDeleteParentComment(parameter);
 
 		return ResponseEntity.ok(DataResponse.ok());
diff --git a/backend/src/main/java/aimo/backend/domains/comment/dto/request/SaveParentCommentRequest.java b/backend/src/main/java/aimo/backend/domains/comment/dto/request/SaveParentCommentRequest.java
index 6620bc9..b62dbfe 100644
--- a/backend/src/main/java/aimo/backend/domains/comment/dto/request/SaveParentCommentRequest.java
+++ b/backend/src/main/java/aimo/backend/domains/comment/dto/request/SaveParentCommentRequest.java
@@ -7,7 +7,7 @@ public record SaveParentCommentRequest(
 	String content
 ) {
 
-	public static SaveParentCommentRequest of(String content) {
+	public static SaveParentCommentRequest from(String content) {
 		return new SaveParentCommentRequest(content);
 	}
 }
diff --git a/backend/src/main/java/aimo/backend/domains/comment/dto/request/UpdateParentCommentRequest.java b/backend/src/main/java/aimo/backend/domains/comment/dto/request/UpdateParentCommentRequest.java
index b0c9e28..b9ec484 100644
--- a/backend/src/main/java/aimo/backend/domains/comment/dto/request/UpdateParentCommentRequest.java
+++ b/backend/src/main/java/aimo/backend/domains/comment/dto/request/UpdateParentCommentRequest.java
@@ -7,7 +7,7 @@ public record UpdateParentCommentRequest(
 	String content
 ) {
 
-	public static UpdateParentCommentRequest of(String content) {
+	public static UpdateParentCommentRequest from(String content) {
 		return new UpdateParentCommentRequest(content);
 	}
 }
diff --git a/backend/src/main/java/aimo/backend/domains/comment/entity/ParentComment.java b/backend/src/main/java/aimo/backend/domains/comment/entity/ParentComment.java
index e900c77..bb54e6b 100644
--- a/backend/src/main/java/aimo/backend/domains/comment/entity/ParentComment.java
+++ b/backend/src/main/java/aimo/backend/domains/comment/entity/ParentComment.java
@@ -61,7 +61,6 @@ public Integer getLikesCount() {
 	private ParentComment(
 		String nickname,
 		String content,
-		Boolean isDeleted,
 		Member member,
 		Post post,
 		List<ChildComment> childComments,
@@ -69,7 +68,7 @@ private ParentComment(
 	) {
 		this.nickname = nickname;
 		this.content = content;
-		this.isDeleted = isDeleted;
+		this.isDeleted = false;
 		this.member = member;
 		this.post = post;
 		this.childComments = childComments;
@@ -84,18 +83,19 @@ public static ParentComment of(
 		return ParentComment.builder()
 			.nickname(member.getNickname())
 			.content(content)
-			.isDeleted(false)
 			.member(member)
 			.post(post)
 			.build();
 	}
 
+	// 부모 댓글 이름 삭제
 	public void deleteParentCommentSoftly() {
 		this.member = null;
 		this.nickname = CommentConstants.UNKNOWN_MEMBER.getValue();
 		this.isDeleted = true;
 	}
 
+	// 부모 댓글 이름, 내용 삭제
 	public void deleteParentCommentSoftlyWithContent() {
 		this.member = null;
 		this.nickname = CommentConstants.UNKNOWN_MEMBER.getValue();
@@ -103,10 +103,12 @@ public void deleteParentCommentSoftlyWithContent() {
 		content = CommentConstants.DELETED_COMMENT.getValue();
 	}
 
+	// 부모 댓글 수정
 	public void updateContent(String content) {
 		this.content = content;
 	}
 
+	// 자식 댓글 삭제
 	public void deleteChildComment(Long childCommentId) {
 		childComments.removeIf(childComment -> childComment.getId().equals(childCommentId));
 	}
diff --git a/backend/src/main/java/aimo/backend/domains/comment/repository/ParentCommentRepository.java b/backend/src/main/java/aimo/backend/domains/comment/repository/ParentCommentRepository.java
index 4b3d10a..bba20b7 100644
--- a/backend/src/main/java/aimo/backend/domains/comment/repository/ParentCommentRepository.java
+++ b/backend/src/main/java/aimo/backend/domains/comment/repository/ParentCommentRepository.java
@@ -9,7 +9,7 @@
 
 public interface ParentCommentRepository extends JpaRepository<ParentComment, Long> {
 
-	Boolean existsByIdAndMember(Long id, Member member);
+	Boolean existsByIdAndMember_Id(Long id, Long memberId);
 
 	List<ParentComment> findByMemberId(Long memberId);
 
diff --git a/backend/src/main/java/aimo/backend/domains/comment/service/ParentCommentMemberService.java b/backend/src/main/java/aimo/backend/domains/comment/service/ParentCommentMemberService.java
index 28fe3e2..5deb3d1 100644
--- a/backend/src/main/java/aimo/backend/domains/comment/service/ParentCommentMemberService.java
+++ b/backend/src/main/java/aimo/backend/domains/comment/service/ParentCommentMemberService.java
@@ -13,6 +13,7 @@
 import aimo.backend.domains.comment.repository.ParentCommentRepository;
 import aimo.backend.domains.member.entity.Member;
 import aimo.backend.domains.member.repository.MemberRepository;
+import aimo.backend.domains.member.service.MemberService;
 import aimo.backend.domains.post.entity.Post;
 import aimo.backend.domains.post.service.PostService;
 import lombok.RequiredArgsConstructor;
@@ -25,10 +26,11 @@ public class ParentCommentMemberService {
 	private final PostService postService;
 	private final ParentCommentRepository parentCommentRepository;
 	private final MemberRepository memberRepository;
+	private final MemberService memberService;
 
 	// 부모 댓글 권한 확인
-	private void validateParentCommentAuthority(Member member, Long commentId) {
-		Boolean exists = parentCommentRepository.existsByIdAndMember(commentId, member);
+	private void validateParentCommentAuthority(Long memberId, Long commentId) {
+		Boolean exists = parentCommentRepository.existsByIdAndMember_Id(commentId, memberId);
 
 		if (!exists) {
 			throw ApiException.from(UNAUTHORIZED_PARENT_COMMENT);
@@ -40,9 +42,11 @@ private void validateParentCommentAuthority(Member member, Long commentId) {
 	public void saveParentComment(SaveParentCommentParameter parameter) {
 		Long memberId = parameter.memberId();
 		Long postId = parameter.postId();
+
 		Member member = memberRepository.findById(memberId)
 			.orElseThrow(() -> ApiException.from(MEMBER_NOT_FOUND));
 		Post post = postService.findById(postId);
+
 		ParentComment parentComment = ParentComment.of(member, post, parameter.content());
 
 		parentCommentRepository.save(parentComment);
@@ -51,11 +55,12 @@ public void saveParentComment(SaveParentCommentParameter parameter) {
 	// 부모 댓글 수정
 	@Transactional(rollbackFor = ApiException.class)
 	public void validateAndUpdateParentComment(UpdateParentCommentParameter parameter) {
-		Member member = memberRepository.findById(parameter.memberId())
-			.orElseThrow(() -> ApiException.from(MEMBER_NOT_FOUND));
-		validateParentCommentAuthority(member, parameter.parentCommentId());
+		Long memberId = parameter.memberId();
+		Long parentCommentId = parameter.parentCommentId();
+
+		validateParentCommentAuthority(memberId, parentCommentId);
 
-		ParentComment parentComment = parentCommentRepository.findById(parameter.parentCommentId())
+		ParentComment parentComment = parentCommentRepository.findById(parentCommentId)
 			.orElseThrow(() -> ApiException.from(PARENT_COMMENT_NOT_FOUND));
 
 		parentComment.updateContent(parameter.content());
@@ -64,10 +69,10 @@ public void validateAndUpdateParentComment(UpdateParentCommentParameter paramete
 	// 부모 댓글 삭제
 	@Transactional(rollbackFor = ApiException.class)
 	public void validateAndDeleteParentComment(DeleteParentCommentParameter parameter) {
-		Member member = memberRepository.findById(parameter.memberId())
-			.orElseThrow(() -> ApiException.from(MEMBER_NOT_FOUND));
+		Long memberId = parameter.memberId();
 		Long commentId = parameter.parentCommentId();
-		validateParentCommentAuthority(member, commentId);
+
+		validateParentCommentAuthority(memberId, commentId);
 
 		parentCommentRepository.findById(commentId)
 			.ifPresent((parentComment) -> {
@@ -91,7 +96,6 @@ public void deleteIfParentCommentIsDeletedAndChildrenIsEmpty(ParentComment paren
 		if (!parentComment.getIsDeleted()) {
 			return;
 		}
-
 		// 자식 댓글이 존재하면 return
 		if(!parentComment.getChildComments().isEmpty()){
 			return;