Legal basis: Civil Code of People's Republic of China (PRC).
Article 122 If another person obtains improper benefits without legal basis, the person who has suffered losses shall have the right to ask him to return the improper benefits.
Article 985 When the beneficiary obtains improper benefits without legal basis, the aggrieved person may request the beneficiary to return the benefits obtained, except in any of the following circumstances:
(1) Remuneration for performing moral obligations;
(2) Liquidation before the maturity of debts;
(three) knowing that there is no obligation to pay.