Legal analysis: If the person who signed the contract is not himself, the other party may constitute contract fraud, and may sue the court to claim that the contract is invalid, and the civil legal act of malicious collusion between the actor and the counterpart to harm the legitimate rights and interests of others is invalid.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 154 A civil legal act in which the actor colludes with the counterpart in bad faith and damages the legitimate rights and interests of others is invalid.

Article 155 A civil juristic act that is invalid or revoked is not legally binding from the beginning.