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
Lau Kin Ming
Tony Leung Chiu-wai
Chan Wing Yan
Anthony Wong Chau-Sang
Wong Chi Shing
Eric Tsang Chi-Wai
Hon Sam
Kelly Chen
Lee Sum Yee
Sammi Cheng Sau-Man
Mary
Elva Hsiao
May
Chapman To Man-Chat
Silly Keung
