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

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