Bumbling Hong Kong detectives Lui (Kenny Bee) and Leung (Tony Leung Ka-Fai) go undercover in an apartment complex to keep watch over Pearl Chan (Carina Lau), a high school teacher who is suspected to be connected to a rare diamond theft involving a notorious thief named Mr. Mickey (Simon Yam). Meanwhile, the legendary Black Rose (Veronica Yip) appears and is also in pursuance of Mr. Mickey, wanting him to surrender himself and the diamond in order to clear her name.
| Actor | Role |
|---|---|
 Tony Leung Ka-faiKeith Lui Kei | Keith Lui Kei |
 Carina LauNot listed | Not listed |
 Kenny BeeNot listed | Not listed |
 Simon YamMicky | Micky |
 Veronica Yip Yuk-hingNot listed | Not listed |
 Charine Chan Ka-LingNot listed | Not listed |
 Bowie Lam Bo-YeeNot listed | Not listed |
 Ku FengNot listed | Not listed |
 Lo HungNot listed | Not listed |
 Tommy Leung Ga-ShuNot listed | Not listed |
 Jameson Lam Wa-FanNot listed | Not listed |