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
刘健明
Tony Leung Chiu-wai
陈永仁
Anthony Wong Chau-Sang
黄志诚
Eric Tsang Chi-Wai
韩琛
Kelly Chen Hui-Lin
李心儿
Sammi Cheng Sau-Man
Mary
Elva Hsiao
May
Chapman To Man-Chat
傻强
Gordon Lam Ka-Tung
大B
Shawn Yue Man-Lok
少年陈永仁
Edison Chen
少年刘健明
Berg Ng Ting-Yip
张Sir
Wan Chi-Keung
梁警司
Dion Lam
迪比亚路
Tony Ho
疑犯
