diff --git a/src/main/java/com/gt/genti/domain/Creator.java b/src/main/java/com/gt/genti/domain/Creator.java
index 13cd246a..05ca37aa 100644
--- a/src/main/java/com/gt/genti/domain/Creator.java
+++ b/src/main/java/com/gt/genti/domain/Creator.java
@@ -56,11 +56,11 @@ public class Creator extends BaseTimeEntity {
 	BankType bankType;
 
 	@Column(name = "account_number", nullable = false)
-	@ColumnDefault("")
+	@ColumnDefault("''")
 	String accountNumber;
 
 	@Column(name = "account_holder", nullable = false)
-	@ColumnDefault("")
+	@ColumnDefault("''")
 	String accountHolder;
 
 	@Column(name = "completed_task_count", nullable = false)
diff --git a/src/main/java/com/gt/genti/domain/PictureGenerateResponse.java b/src/main/java/com/gt/genti/domain/PictureGenerateResponse.java
index 5d6547db..699dae37 100644
--- a/src/main/java/com/gt/genti/domain/PictureGenerateResponse.java
+++ b/src/main/java/com/gt/genti/domain/PictureGenerateResponse.java
@@ -51,11 +51,11 @@ public class PictureGenerateResponse extends BaseTimeEntity {
 	PictureGenerateResponseStatus status;
 
 	@Column(name = "memo", nullable = false)
-	@ColumnDefault("")
+	@ColumnDefault("''")
 	String memo;
 
 	@Column(name = "admin_in_charge", nullable = false)
-	@ColumnDefault("")
+	@ColumnDefault("''")
 	String adminInCharge;
 
 	@Column(name = "submitted_by_creator_at")
diff --git a/src/main/java/com/gt/genti/domain/User.java b/src/main/java/com/gt/genti/domain/User.java
index 73178610..ff2d1648 100644
--- a/src/main/java/com/gt/genti/domain/User.java
+++ b/src/main/java/com/gt/genti/domain/User.java
@@ -65,7 +65,7 @@ public class User extends BaseTimeEntity {
 	Sex sex;
 
 	@Column(name = "introduction", nullable = false)
-	@ColumnDefault("")
+	@ColumnDefault("''")
 	String introduction;
 
 	@Column(name = "username", nullable = false)