Jiufuwanka said that he would sue me and let the court force me to pay back the money.

Legal analysis: the parties must perform the legally effective civil judgments and rulings. If one party refuses to perform, the other party may apply to the people's court for execution, or the judge may transfer it to the person subjected to execution for execution.

Legal basis: Article 236 of the Civil Procedure Law of People's Republic of China (PRC). A legally effective civil judgment or ruling must be fulfilled by the parties concerned. If one party refuses to perform, the other party may apply to the people's court for execution, or the judge may transfer it to the person subjected to execution for execution. Mediation and other legal documents that should be executed by the people's court must be fulfilled by the parties. If one party refuses to perform, the other party may apply to the people's court for execution.