What will happen if the accusation fails?

It doesn't matter. If the accusation is not established, the punishment for the applicant will not be aggravated. Its purpose is to give the applicant a way of relief. It is illegal to aggravate the punishment after reconsideration.

People's Republic of China (PRC) Administrative Reconsideration Law

Article 35 Any functionary of an administrative reconsideration organ who engages in malpractices for personal gain or commits other dereliction of duty or dereliction of duty in administrative reconsideration activities shall be given administrative sanctions such as warning, demerit recording and gross demerit recording according to law; If the circumstances are serious, administrative sanctions such as demotion, dismissal and expulsion shall be given according to law; If a crime is constituted, criminal responsibility shall be investigated according to law.