diff --git a/apps/assets/models/user.py b/apps/assets/models/user.py
index fcdb9e244..3f8849188 100644
--- a/apps/assets/models/user.py
+++ b/apps/assets/models/user.py
@@ -215,7 +215,7 @@ class SystemUser(ProtocolMixin, AuthMixin, BaseUser):
     def __str__(self):
         username = self.username
         if self.username_same_with_user:
-            username = 'dynamic'
+            username = '*'
         return '{0.name}({1})'.format(self, username)
 
     @property
@@ -270,11 +270,6 @@ class SystemUser(ProtocolMixin, AuthMixin, BaseUser):
         assets = Asset.objects.filter(id__in=asset_ids)
         return assets
 
-    def save(self, *args, **kwargs):
-        if self.username_same_with_user:
-            self.username = '*'
-        return super().save(*args, **kwargs)
-
     class Meta:
         ordering = ['name']
         unique_together = [('name', 'org_id')]
diff --git a/apps/assets/serializers/system_user.py b/apps/assets/serializers/system_user.py
index abb70c47c..381b46592 100644
--- a/apps/assets/serializers/system_user.py
+++ b/apps/assets/serializers/system_user.py
@@ -97,13 +97,12 @@ class SystemUserSerializer(AuthSerializerMixin, BulkOrgResourceModelSerializer):
         protocol = self.initial_data.get("protocol")
         username_same_with_user = self.initial_data.get("username_same_with_user")
 
-        if login_mode == SystemUser.LOGIN_AUTO and \
-                protocol != SystemUser.Protocol.vnc:
+        if username_same_with_user:
+            return ''
+
+        if login_mode == SystemUser.LOGIN_AUTO and protocol != SystemUser.Protocol.vnc:
             msg = _('* Automatic login mode must fill in the username.')
             raise serializers.ValidationError(msg)
-
-        if username_same_with_user:
-            username = '*'
         return username
 
     def validate_home(self, home):