In fact, this issue has been controversial in the legal field. A few people think that the victim is not a party to the case and has no right to directly apply for enforcement without taking part in the lawsuit.
However, most people think that the victim should be given the right to directly apply for filing for execution. If the victim does not apply for enforcement, it is difficult to enforce the defendant by the court alone. Moreover, because the victim can't sue, the victim has no relief channels to safeguard his legitimate rights and interests.
So now many courts agree that the victim applies for enforcement. Some courts do not agree with the victim's application for execution, but file a case for execution in the court's own name after the victim petitioned.