Chan Wing Yan, a young police officer, has been sent undercover as a mole in the local mafia. Lau Kin Ming, a young mafia member, infiltrates the police force. Years later, their older counterparts, Chen Wing Yan and Inspector Lau Kin Ming, respectively, race against time to expose the mole within their midst.
Andy Lau
Tony Leung Chiu-wai
Anthony Wong Chau-Sang
Eric Tsang Chi-Wai
Kelly Chen
Sammi Cheng
Elva Hsiao
Chapman To Man-Chat
Gordon Lam Ka-Tung
Shawn Yue
Edison Chen
Berg Ng Ting-Yip
Wan Chi-Keung
Dion Lam
Tony Ho
Courtney Wu
Hui Kam Fung
Chaucharew Wichai
Au Hin-Wai
Lee Tin-Cheung
Victy Wong Yin-Keung
Yiu Man-Kei
Benjamin Yuen Wai-Ho
Wong Chi-Wang
Cheng Wing-Yee
Mak Wai-Gok
Kui Mei-Yee
Tam Kon-Chung
Che Jan-Bong
Chin Yiu-Wing
Ho Chun-Hin
Simon Yu Sai-Tang
So Wai-Nam
Lai Chi-Wai
Jerry Leung Ho-Kai
Terry Lee Ji-Ming
Alex Lee Yip-Kin
Chow Pok-Foo
Hui On-Tat
Ho Wing-Ning
Simon Cheung Yuk-San
Leung Chiu-Yee
Chang Kin-Yung
Lee Wah-Chu
Pauline Yeung Yung-Lin