The Bad Boy Squad, a variety of private detective agency, is composed of King (Ekin Cheng Yi-kin), Queen (Kristy Yeung), and Jack (Louis Koo Tin-lok), whose primary source of business is the reuniting of clientèle with their first flames, and when the trio of young operatives returns to Hong Kong from an assignment in Thailand and the Squad's next three customers supply photographs of lost loves, the women in the pictures appear to be the same individual.
| Actor | Role |
|---|---|
 Ekin Cheng Yee-KinKing Chan | King Chan |
 Louis KooJack Shum | Jack Shum |
 Shu QiShadow/Kwan Chin/Eleven | Shadow/Kwan Chin/Eleven |
 Kristy Yang GongruQueen Chan | Queen Chan |
 Daniel Chan Hiu-TungTin Ai | Tin Ai |
 Mark Cheng Ho-NamTaro Sakamoto | Taro Sakamoto |
 Jerry Lamb Hiu-FungYung's Henchman | Yung's Henchman |
 Ko I-chenNot listed | Not listed |
 Blackie Ko Sau-LeungDark Tung | Dark Tung |
 Frankie Ng Chi-HungPolice Officer | Police Officer |
 Helena Law LanSophia | Sophia |
 Kong HonGable | Gable |
 Sammy LeungSammy | Sammy |
 Kitty Yuen Siu-YeeYee | Yee |
 Kelly Lin Hsi-LeiAngel | Angel |
 Gigi Lai ChiTiny | Tiny |
 Josie HoJean | Jean |
 Stephanie Che Yuen-YuenMarie | Marie |
 AnyaDJ | DJ |
 Vincent Kok Tak-ChiuTiny's Former Boyfriend | Tiny's Former Boyfriend |
| CChan Yuk-FongNot listed | Not listed |
| KKelly Chen Bai-YuNot listed | Not listed |
 Lee Tat-ChiuPoliceman | Policeman |
 Leon HeadNot listed | Not listed |