diff --git a/internal/circle/model/model.go b/internal/circle/model/model.go
index af1c2c6..e731f1e 100644
--- a/internal/circle/model/model.go
+++ b/internal/circle/model/model.go
@@ -33,7 +33,7 @@ type UserCircle struct {
 
 type UserCircleDetail struct {
 	UserCircle
-	Username         string                  `json:"username" gorm:"column:username"`
+	Username         string                  `json:"-" gorm:"column:username"`
 	DisplayName      string                  `json:"displayName" gorm:"column:display_name"`
 	NotificationType nModel.NotificationType `json:"-" gorm:"column:notification_type"`
 	TargetID         string                  `json:"-" gorm:"column:target_id"` // Target ID