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You can stream Infernal Affairs (2002) on Max with a subscription, rent on Apple TV+, or buy on Apple TV+.

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.

The tension stems not from explosive shootouts, but from the suffocating paranoia of two men trapped in each other's lives. This cat-and-mouse game turns the traditional undercover trope into a psychological stalemate where identity is the ultimate casualty.

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