Infernal Affairs Collection
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.
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A cat-and-mouse game unfolds as a mole within the police department and an undercover cop engage in a precarious dance, both driven by a singular goal: to uncover the identity of the other.
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In this prequel, two individuals take on new roles: Chan Wing Yan becomes a triad undercover cop, while Lau Kin Ming joins the police force. As they navigate their respective paths, they inadvertently find themselves on opposite sides of a rivalry with a common enemy, a crime boss.
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Months following the original film, Ming becomes suspicious of a police superintendent, believing them to be a new mole working for the triads. Meanwhile, years prior, Yan undertakes his inaugural mission.