diff --git a/backend/src/main/java/aimo/backend/common/mapper/PostMapper.java b/backend/src/main/java/aimo/backend/common/mapper/PostMapper.java
index bdb413f..23784ae 100644
--- a/backend/src/main/java/aimo/backend/common/mapper/PostMapper.java
+++ b/backend/src/main/java/aimo/backend/common/mapper/PostMapper.java
@@ -81,7 +81,7 @@ public static FindPostAndCommentsByIdResponse toFindPostAndCommentsByIdResponse(
 		return new FindPostAndCommentsByIdResponse(
 			post.getMember() == member,
 			post.getTitle(),
-			post.getMember().getUsername(),
+			post.getMember().getMemberName(),
 			post.getSummaryAi(),
 			post.getPostLikesCount(),
 			post.getPostViewsCount(),
diff --git a/backend/src/main/java/aimo/backend/domains/member/dto/SignUpRequest.java b/backend/src/main/java/aimo/backend/domains/member/dto/SignUpRequest.java
index 68003dd..474ddba 100644
--- a/backend/src/main/java/aimo/backend/domains/member/dto/SignUpRequest.java
+++ b/backend/src/main/java/aimo/backend/domains/member/dto/SignUpRequest.java
@@ -5,16 +5,18 @@
 import aimo.backend.domains.member.model.Gender;
 import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Past;
 
 public record SignUpRequest(
 	@NotBlank(message = "userName이 빈 문자열입니다.")
-	String username,
+	String memberName,
 	@Email(message = "email 형식이 아닙니다.")
 	String email,
 	@NotBlank(message = "password가 빈 문자열입니다.")
 	String password,
-  @NotNull(message = "gender가 비었습니다.")
+  	@NotNull(message = "gender가 비었습니다.")
 	Gender gender,
-  @Past(message = "생년월일은 과거 날짜여야 합니다.")
+  	@Past(message = "생년월일은 과거 날짜여야 합니다.")
 	LocalDate birth
 ) {}
diff --git a/backend/src/main/java/aimo/backend/domains/member/repository/MemberRepository.java b/backend/src/main/java/aimo/backend/domains/member/repository/MemberRepository.java
index 782438b..0ca27c3 100644
--- a/backend/src/main/java/aimo/backend/domains/member/repository/MemberRepository.java
+++ b/backend/src/main/java/aimo/backend/domains/member/repository/MemberRepository.java
@@ -12,7 +12,7 @@ public interface MemberRepository extends JpaRepository<Member, Long> {
 
 	void deleteMemberByEmail(String email);
 
-	boolean existsByUsername(String username);
+	boolean existsByMemberName(String memberName);
 
 	boolean existsByEmail(String email);
 }
diff --git a/backend/src/main/java/aimo/backend/domains/member/service/MemberService.java b/backend/src/main/java/aimo/backend/domains/member/service/MemberService.java
index 9386f71..f473b05 100644
--- a/backend/src/main/java/aimo/backend/domains/member/service/MemberService.java
+++ b/backend/src/main/java/aimo/backend/domains/member/service/MemberService.java
@@ -51,7 +51,7 @@ public void signUp(SignUpRequest signUpRequest) {
 		validateDuplicateEmail(signUpRequest.email());
 
 		// 중복 닉네임 검사
-		validateDuplicateUsername(signUpRequest.username());
+		validateDuplicateUsername(signUpRequest.memberName());
 
 		Member member = memberMapper.signUpMemberEntity(signUpRequest);
 		memberRepository.save(member);
@@ -133,7 +133,7 @@ private void validateDuplicateEmail(String email) {
 
 	// 닉네임 중복 검사
 	private void validateDuplicateUsername(String username) {
-		if (memberRepository.existsByUsername(username)) {
+		if (memberRepository.existsByMemberName(username)) {
 			throw ApiException.from(ErrorCode.USERNAME_DUPLICATE);
 		}
 	}
diff --git a/backend/src/main/java/aimo/backend/domains/privatePost/controller/PrivatePostController.java b/backend/src/main/java/aimo/backend/domains/privatePost/controller/PrivatePostController.java
index e269ecf..817bf7a 100644
--- a/backend/src/main/java/aimo/backend/domains/privatePost/controller/PrivatePostController.java
+++ b/backend/src/main/java/aimo/backend/domains/privatePost/controller/PrivatePostController.java
@@ -21,6 +21,7 @@
 import aimo.backend.domains.privatePost.dto.ChatRecordRequest;
 import aimo.backend.domains.privatePost.dto.PrivatePostPreviewResponse;
 import aimo.backend.domains.privatePost.dto.PrivatePostResponse;
+import aimo.backend.domains.privatePost.dto.SaveAudioSuccessRequest;
 import aimo.backend.domains.privatePost.dto.SaveAudioSuccessResponse;
 import aimo.backend.domains.privatePost.dto.SpeachToTextRequest;
 import aimo.backend.domains.privatePost.dto.SpeachToTextResponse;