Idealistic police cadet Chan Wing-Yan is recruited by Police Superintendant Wong to go deep undercover as a member of the criminal Triad society. Into the same cadet class, crime boss Hon Sam installs new Triad member Lau Kin Ming 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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Trailer for: 'Infernal Affairs'