Plot: The setting is the never-ending war between the police and the Triads of Hong Kong. Chan is a cop who's been assigned to undercover work inside the Triads for so long that he's been able to rise through the ranks to a position of some authority. Lau, meanwhile, is a secret member of the Triads who has infiltrated the police force with an equal level of success. As they feed their bosses information on the plans and counter-plans of the organizations they pretend to serve, they both begin to feel the stresses of their double lives as they become torn between the oppressive obligations they owe to their superiors and the growing camaraderie they share with the foot soldiers around them. As the two organizations become increasingly aware of the moles in their midsts, the race is on for Chan and Lau to try and get out of the game alive
Alternative Plot: Idealistic police cadet Chan Wing-Yan (Tony Leung) is recruited by Police Superintendant Wong (Anthony Wong) to go deep undercover as a member of the criminal Triad society. Into the same cadet class, crime boss Hon Sam (Eric Tsang) installs new Triad member Lau Kin Ming (Andy Lau) to become a long-term mole for the gang. A decade later, both have risen through the ranks in their respective aliases -- but when both of their covers are in danger of being blown, a game of life and death ensues.
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