There is no solution. Even if he signed the iou, you can't help it. The normal procedure is this: if he says that there is no money to pay back, it is useless for you to call the police, and the police can only persuade you. In the end, I can only sue in court. If you really owe you money, the court will sentence him to pay you back and then make a judgment. You still have to get it back yourself. You can't help it if you want to. If the police come, they will also advise you. Finally, you have to apply to the court for enforcement. This process is more complicated than cooking miscellaneous sauce noodles. After the application, you have to sell the property in his own name and return it to you. Nothing you can do can stop it. It is estimated that the money you spend on such a trip will greatly exceed the money he owes you. So ... . In China, owing money to others is many times more than lending money to others. . .