Buddy cops Porky (Kent Cheng) and Big Mouth (Wong Ching) are promoted to the anti-prostitution division after solving a robbery case. In their bid to crack down on a prostitution ring, the bumbling duo arrange for Margaret (Pat Ha) to go undercover as a hooker as part of their supposedly foolproof plan, which unfortunately and inevitably has to go wrong...
Sgt Porky
Det. Gambler Mok
Det. Big Mouth
Sgt Chiu Kau
Det. Rocky
Boby
Station O.C.
Margaret
Luk Kim Ming
Doc
K. K.
Aunt Kau
Station cleaner
Margaret's lawyer
Big Shot
Nut
Policeman arresting Nut