legal ground
Article 54 of the Criminal Procedure Law
The people's court shall, within three days from the date of accepting a case of private prosecution, inform the private prosecutor and his legal representative, the parties to an incidental civil action and his legal representative that they have the right to entrust an agent ad litem, and inform them that they can apply for legal aid if they are in financial difficulties. Article 56 An agent ad litem has the right to safeguard the litigation rights and other legitimate rights and interests of the victim, the private prosecutor and the parties involved in incidental civil litigation according to facts and laws.