Whether you are legally responsible for signing on someone else’s behalf depends on the circumstances. If the agent has the legal authorization of the party or the party subsequently ratifies the contract, the legal consequences of the contract's effectiveness shall be borne by the client; if the agent does not have the authorization or exceeds the scope of authorization, any consequences arising from the act of acting shall be borne by the client. The legal consequences shall be borne by the person signing on behalf of the person. Article 165 of the "People's Republic of China and Civil Code" If the authorization for agency is in written form, the power of attorney shall state the name of the agent, matters of agency, authority and period, and shall be signed by the principal. Sign or stamp. Article 171 If the actor has no agency authority, exceeds the agency authority, or continues to perform agency acts after the termination of the agency authority, without ratification by the principal, it will not be effective against 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. Article 172 If the actor has no agency authority, exceeds the agency authority, or continues to perform agency acts after the termination of the agency authority, and the counterparty has reason to believe that the actor has agency authority, the agency act is valid.