diff --git a/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java b/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java
index 29e4367..2421ef6 100644
--- a/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java
+++ b/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java
@@ -44,14 +44,4 @@ public class Member extends BaseEntity {
     @Column(name = "last_login_at")
     private LocalDateTime lastLoginAt;
     
-    /**
-     * 엔티티 저장 후 실행되는 메서드
-     * createdOid와 updatedOid를 자기 자신의 oid로 설정
-     */
-    @PostPersist
-    protected void onPostPersist() {
-        if (this.getCreatedOid() == null) {
-            this.setCreatedOid(this.getOid());
-        }
-    }
 }
\ No newline at end of file
diff --git a/src/main/java/com/bio/bio_backend/domain/user/member/service/MemberServiceImpl.java b/src/main/java/com/bio/bio_backend/domain/user/member/service/MemberServiceImpl.java
index 40b6451..65ed12c 100644
--- a/src/main/java/com/bio/bio_backend/domain/user/member/service/MemberServiceImpl.java
+++ b/src/main/java/com/bio/bio_backend/domain/user/member/service/MemberServiceImpl.java
@@ -17,6 +17,8 @@ import org.springframework.transaction.annotation.Transactional;
 import java.util.List;
 import java.util.Map;
 
+import static com.bio.bio_backend.global.utils.OidUtil.generateOid;
+
 @Service
 @RequiredArgsConstructor
 @Slf4j
@@ -52,6 +54,10 @@ public class MemberServiceImpl implements MemberService {
                 .password(bCryptPasswordEncoder.encode(memberDTO.getPassword()))
                 .role(MemberRole.getDefault())
                 .build();
+
+        Long oid = generateOid();
+        member.setOid(oid);
+        member.setCreatedOid(oid);
         
         Member savedMember = memberRepository.save(member);
         
diff --git a/src/main/java/com/bio/bio_backend/global/entity/BaseEntity.java b/src/main/java/com/bio/bio_backend/global/entity/BaseEntity.java
index 86ed367..f8652c3 100644
--- a/src/main/java/com/bio/bio_backend/global/entity/BaseEntity.java
+++ b/src/main/java/com/bio/bio_backend/global/entity/BaseEntity.java
@@ -6,10 +6,11 @@ import lombok.Setter;
 import org.springframework.data.annotation.CreatedDate;
 import org.springframework.data.annotation.LastModifiedDate;
 import org.springframework.data.jpa.domain.support.AuditingEntityListener;
-import com.bio.bio_backend.global.utils.OidUtil;
 
 import java.time.LocalDateTime;
 
+import static com.bio.bio_backend.global.utils.OidUtil.generateOid;
+
 /**
  * 모든 엔티티가 상속받는 기본 엔티티 클래스
  * 공통 필드들을 정의하고 JPA Auditing을 지원합니다.
@@ -40,14 +41,7 @@ public abstract class BaseEntity {
     
     @PrePersist
     protected void onCreate() {
-        LocalDateTime now = LocalDateTime.now();
-        this.oid = OidUtil.generateOid();
-        this.createdAt = now;
-        this.updatedAt = now;
-    }
-
-    @PreUpdate
-    protected void onUpdate() {
-        this.updatedAt = LocalDateTime.now();
+        if(this.oid == null) this.oid = generateOid();
+        if(this.createdOid != null && this.updatedOid == null) this.updatedOid = this.createdOid;
     }
 }