Trama:
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.

Cast:

Andy Lau Lau Kin-Ming

Tony Leung Chiu-wai Chan Wing-Yan

Anthony Wong Wong Chi-Shing

Eric Tsang Hon Sam

Kelly Chen Lee Sum-Yee

Sammi Cheng Mary

Edison Chen Lau Kin-Ming (young)

Shawn Yue Chan Wing-Yan (young)

Chapman To "Silly" Keung

Dion Lam Dik-On Del Piero

Gordon Lam Inspector B

Wan Chi-Keung Officer Leung

Berg Ng Senior Inspector Cheung

Tony Ho Suspect

Elva Hsiao May

Courtney Wu Stereo Shop Owner

Victy Wong Yin-Keung CIB Team

Eric Li Tin Cheung Double 8

So Wai-Nam Sam's Follower

Chaucharew Wichai

Supporto: Sconosciuto,

In prestito: No

Rapporto: Unknown