Article 8 A contract established according to law is legally binding on the parties. The parties shall perform their obligations as agreed, and shall not alter or terminate the contract without authorization. Contracts established according to law are protected by law. Article 107 If a party fails to perform its contractual obligations or fails to perform the contractual obligations in conformity with the contract, it shall be liable for breach of contract such as continuing to perform, taking remedial measures or compensating for losses. According to the above regulations, if there is no reason for returning a house as stipulated in the purchase contract, it is generally impossible to return a house. However, if the developer or the owner breaches the contract, which leads to the agreed reason for returning the house, all the purchase money obtained by the developer or the owner from you shall be returned to you due to the cancellation of the purchase contract. The bank mortgage loan you applied for is also part of the purchase price and should be returned to you together. Then, you should negotiate with the bank to return the remaining loan principal and interest to the bank in advance (part of which has been repaid monthly before) according to the provisions of paragraph 5 of Article 32 of the General Rules for Loans, "The borrower shall negotiate with the lender when repaying in advance". The above suggestions are for your reference.