Andy Lau
Tony Leung Chiu Wai
Anthony Wong Chau-Sang
Eric Tsang
Kelly Chen
Sammi Cheng
Edison Chen
Shawn Yue
Elva Hsiao
Chapman To

Andy Lau as Inspector Lau Kin Ming
Tony Leung Chiu Wai as Chan Wing Yan (as Tony Leung)
Anthony Wong Chau-Sang as SP Wong Chi Shing (as Anthony Wong)
Eric Tsang as Hon Sam
Kelly Chen as Dr. Lee Sum Yee
Sammi Cheng as Mary
Edison Chen as Young Lau Kin Ming
Shawn Yue as Young Chan Wing Yan
Elva Hsiao as May
Chapman To as Tsui Wai-keung
Ka Tung Lam as Inspector B
Ting Yip Ng as Inspector Cheung
Chi Keung Wan as Officer Leung
Dion Lam as Del Piero
Hui Kam Fung as Cadet School Principal