Invincible Enforcer

Ba wan zui ren is a movie starring Tony Liu, Fanny Fen-Ni, and Helen Poon. A probation officer tries to help a prisoner who faces harassment from corrupt guards and inmates.
A young man who is thrown into jail simply because he displeases a police inspector. But even when he's eventually released, the police continue to persecute him until he feels he has no choice but to become a real criminal.