回复：你只要在21天内把押金还他就行，就不怕他告你了，管房子，不能生气，做好自己应该做的

Thank you.

In fact, 1 week after their moveout I told them that I had 21 days to issue refunds, although I understand that they should find this out themsevles and that I am not obligated to tell them this.