Legal analysis: If someone else impersonates a signature without authorization, they do not need to bear the legal responsibility for the signature. The responsibility for the signature lies with the actual signer. If there is no power of agency, the power of agency is exceeded, or the behavior is performed after the power of agency is terminated, the principal will bear civil liability only after ratification by the principal. For acts that have not been ratified, the perpetrator shall bear civil liability. If the person knows that another person has committed a civil act in his own name and does not deny it, it shall be deemed as consent.

Legal basis: Article 171 of the "People's Republic of China and the Civil Code" If ratified by the agent, it will have no effect on the principal. The counterparty may urge the principal to ratify it within thirty days from the date of receipt of the notice. If the principal fails to make any representation, it shall be deemed as a refusal to ratify. Before the act performed by the actor is ratified, the counterparty in good faith has the right to revoke it. Cancellation shall be made by notification. If the act performed by the actor has not been ratified, the counterparty in good faith has the right to request the actor to perform the debt or to request compensation from the actor for the damage suffered. However, the scope of compensation shall not exceed the benefits that the counterparty can obtain when ratified by the agent. If the counterparty knows or should know that the actor has no authority to act, the counterparty and the perpetrator shall bear liability according to their respective faults.