Legal analysis: lawyers should sign, and lawyers should safeguard the legitimate rights and interests of the parties, the correct implementation of the law and the fairness and justice of society. As a trustee, a defense lawyer shall not engage in any act that damages or may damage the legitimate rights and interests of the client at any time when exercising the right of defense. On the contrary, he should be diligent and dedicated, have more professional legal knowledge and more independent defense rights than criminal suspects, and safeguard the legitimate rights and interests of criminal suspects.

Legal basis: Guiding Opinions on Pleading Guilty and Accepting Punishment. Article 31 If a criminal suspect voluntarily pleads guilty and agrees to apply sentencing suggestions and procedures, he shall sign a statement of pleading guilty and accepting punishment and being lenient in the presence of a defender or a lawyer on duty. The written statement shall include the criminal suspect's truthful confession of the crime, the suggestion of agreeing to sentencing, the application of procedures, etc. And signed by the criminal suspect, defender or lawyer on duty.