Only one defendant can be represented, otherwise the illegal act will be punished.
Legal basis:
Criminal Procedure Law of the People's Republic of China
Article 37 The duty of a defender is to present materials and opinions on whether a criminal suspect or defendant is innocent, light or relieved of criminal responsibility according to facts and laws, and to safeguard the litigation rights and other legitimate rights and interests of the criminal suspect or defendant.
Article 38 A defense lawyer may provide legal aid to a criminal suspect during investigation. Acting as an agent for complaints and accusations; Apply for changing compulsory measures; Ask the investigation organ about the crimes and cases suspected by the criminal suspect, and put forward opinions.
Article 7 of the Measures for Punishment of Illegal Acts of Lawyers and Law Firms is an illegal act in which a lawyer "represents both parties in the same case, or represents legal affairs with conflicts of interest with himself and his close relatives" in one of the following circumstances: (1) represents or provides relevant legal services for parties with conflicts of interest in the same civil litigation, administrative litigation or non-litigation legal affairs; (2) Acting as a defender or agent for the defendant and the victim in the same criminal case, or acting as a defender for two or more criminal suspects and defendants at the same time; (3) Providing legal services to the parties who have conflicts of interest with the consulting unit during their tenure as legal advisers; (4) Lawyers who have served as judges and prosecutors act as agents and defenders to undertake cases handled by the original courts and procuratorates; (5) A lawyer who has served as an arbitrator or is still serving as an arbitrator, acting as an agent to undertake the cases handled by the arbitration institution where he previously served or currently serves.