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.
| Actor | Role |
|---|---|
 Nick Cheung Ka-FaiSmart Fai | Smart Fai |
 Suki Kwan Sau-MeiKwan Shi On | Kwan Shi On |
 Athena Chu YanYue Po Wan | Yue Po Wan |
 Ben Ng Ngai-CheungDaniel | Daniel |
 Kingdom Yuen King-TanNatasia | Natasia |
 Sherming Yiu Lok-YeeLaura | Laura |
 Yeung FanIcy | Icy |
 Chan Chi-FaiKo Sheung-Wai | Ko Sheung-Wai |
 Ankee Leung Chi-OnChan Kwok-Wan | Chan Kwok-Wan |
 Anthony Wong Chau-SangHuman Milk Drinking Doctor | Human Milk Drinking Doctor |
 Paco Yick Tin-HungBrother Cow | Brother Cow |
 Joe Ma Tak-ChungPhilip Wong | Philip Wong |
 Jackson Ng Yuk-SueGangster | Gangster |
| AAdam Chan Chung-TaiThai | Thai |
| CChow Tak-WaSuperintendent | Superintendent |
 Tam Tin-BoIcy's Friend | Icy's Friend |