Legal analysis: whether the agent has legal responsibility depends on the situation. If the agent is legally authorized by the parties or the parties ratify the contract afterwards, the legal consequences of the contract's entry into force shall be borne by the client; If the signing agent has no authorization or exceeds the scope of authorization, the legal consequences arising from the signing agent shall be borne by the signing agent.

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

Article 165 If the power of attorney is in written form, it shall specify the name of the agent, the matters to be represented, the authority and the time limit, and shall be signed or sealed by the principal.

Article 171 Where an actor has no agency, exceeds the agency or remains an agent after the agency is terminated, it shall not be effective to the principal without ratification by the principal.