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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.
Infernal Affairs - watch online: streaming, buy or rent
Currently you are able to watch "Infernal Affairs" streaming on Netflix. It is also possible to buy "Infernal Affairs" on Apple iTunes, Google Play Movies, YouTube as download or rent it on Apple iTunes, Google Play Movies, YouTube online.