CIA agent turned sexual predator Daniel (Ben Ng) uses his wealth and collection of high-tech gadgets to prey on unsuspecting women. After arranging for the prison breakout of notorious rapists "Rain Killer" (Ankee Leung) and "Tuen Mun Rapist" (Chan Chi-Fai), Daniel invites the men to ravage the two women he has chained in the basement. He next sets his sights on Kwan Shi-han (Suki Kwan), the romance novelist next door; but first preys on her movie star friend, Icy (Yeung Fan). Desperate for a lead, the police consult a semi-reformed deviant known as "The Human Milk Drinking Doctor" (Anthony Wong), who used to prey on lactating women and now controls his sexual urges by working as a porno theatre projectionist.
Unfortunately the movie Raped by an Angel 4: The Rapist's Union is not yet available on HBO Max.
| Directing | Wong Jing | Director |
| Production | Wong Jing | Producer |
| Production | Catherine Kwan Ka-Diu | Line Producer |
| Production | Chow Tak-Wa | Production Manager |
| Camera | Edmond Fung Yuen-Man | Director of Photography |
| Lighting | Wong Wing-Chi | Gaffer |
| Art | Raymond Kwok Siu-Keung | Art Direction |
| Costume & Make-Up | Lee Pik-Kwan | Costume Designer |
| Directing | Adam Chan Chung-Tai | Action Director |
| Editing | Angie Lam On-Yee | Editor |
| Writing | Wong Jing | Screenplay |
| Sound | EMP | Original Music Composer |
