Lawyers need a power of attorney signed by the parties themselves to handle cases. Lawyers can't represent unless the parties sign it themselves.

If it is not the client's signature, but someone else's signature, it will be risky to be found later, because the lawyer's agency behavior is that he has no right to represent, which is invalid. If there is an effective judgment, the judgment may be invalid and retrial may occur. It's very risky.

Therefore, it is recommended that the parties sign in person to avoid any risks in the later stage.