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.
Senior Inspector Lau Kin-ming
Chan Wing-yan
Superintendent Wong Chi-shing
Hon Sam
Dr. Lee Sum-yee
Mary
May
Tsui Wai-keung
Inspector B
Young Chan Wing-yan
Young Lau Kin-ming
Senior Inspector Cheung
Officer Leung
Del Piero
Suspect
Stereo Shop Owner
Cadet School Principal Yip
Sunny, Thai Drug Dealer
Elephant
Double 8
CIB Team
CIB Team
CIB Officer
CIB Team
CIB Team
CIB Team
CIB Team
CIB Team
CIB Team
CIB Team
Hon Sam's Follower
Hon Sam's Follower
Hon Sam's Follower
Hon Sam's Follower
Hon Sam's Follower
Hon Sam's Follower
Hon Sam's Follower
Hon Sam's Follower
Officer Chan
Superintendent
Cadet School Instructor
May's Daughter
Policeman
Chief Inspector
Nanny
Sam's Follower
