I received your system request for help. The answer is as follows. According to the provisions of the Contract Law, subletting requires the consent of the owner of the original house, otherwise the subletting will be invalid. The second homeowner forged the contract, which was contract fraud. Based on the privity of the contract, you can claim rights against the second homeowner on the grounds of fraud. In addition, according to the judicial interpretation of house leasing, if the original landlord knows about the subletting for more than six months, it is deemed to have agreed to the subletting. In your case, you may face evidence problems. It is recommended that you record the entire process of negotiating with them. If the amount is large, it is recommended to entrust a lawyer. Since I currently use a mobile phone, the answer ends here.