A career-long undercover Hong Kong cop is sent to Mainland China when his former protégé becomes the primary suspect in a murder.
| Actor | Role |
|---|---|
 Donnie YenDragon Chan | Dragon Chan |
 Jing TianFang Jing | Fang Jing |
 Andy On Chi-KitSunny | Sunny |
 Ronald Cheng Chung-KeiCaptain Zhang | Captain Zhang |
 Nina Paw Hei-ChingAmy (Long's Mother) | Amy (Long's Mother) |
 Collin ChouCheung Mo-Hung | Cheung Mo-Hung |
 Yang ZhigangLei Peng | Lei Peng |
 Terence Yin Chi-WaiTerry | Terry |
 Frankie Ng Chi-HungTriad Mahjong Player | Triad Mahjong Player |
 Zhang HanyuBlade | Blade |
 Ken Lo Wai-KwongBrother Bo (Triad Mahjong Player) | Brother Bo (Triad Mahjong Player) |
 Evergreen Mak Cheung-ChingBrother Kun | Brother Kun |
 Andy YanBig Noise Fa | Big Noise Fa |
 Tony HoNot listed | Not listed |
 Yu KangNot listed | Not listed |
 Zhang Zhihanplain-clothed policeman | plain-clothed policeman |