The threeInfernal Affairs films are incredibly twistycops vs. Triads films set inHong Kong between 1991 and 2003.

The first film, set in 2002, is based around the stories of twomirrored infiltrators. Chen Wing Yan is an undercover cop in the gang of the chubby,Affably Evil gangster Hon Sam. Yan's handler isChessmaster senior cop Wong, who doesn't realise that his most trusted underling, Lau Kin Ming, is actually a mole planted in the police force by Sam years before. As Wong's attempts to bring Sam down reach their endgame, Yan and Ming both find their covers in danger of being blown and are both ordered by their pretended bosses to catch the "moles" who are actually themselves.

The second film is aPrequel that tells the story of how Sam rose to his position in the first film, and the unexpected roles that Yan, Ming, and Wong played in that. The third film is a sequel that follows the stories of the surviving characters from the first film, and also tells a flashback story set just before it. It introduces two new significant characters to replace the dead people: Yeung, a smooth and sinister, possibly corrupt, cop from the Security branch; and Shen, a mysterious gangster from the Chinese mainland.

The first film wasremade asThe Departed, which transferred the action to Boston and made the Triad equivalentsIrish-American gangsters, and won the 2006Best Picture Oscar.

• Affably Evil: Sam, mostly.
• Becoming the Mask
• Being Evil Sucks: if you're a gangster, you will probably end up an utterly corrupt, friendless wreck of a human tormented by guilt over your crimes, and you'll probably die young and unpleasantly.
• Being Good Sucks: if you're a cop, you know that society is essentially corrupt, that any gangster you manage to put away will get rapidly replaced, and that you'll probably die young and unpleasantly.
• Bilingual Bonus: Dr. Lee's name is a pun on psychologist in Cantonese.
• Black and Grey Morality: especially in the second and third films.
• Character Tics: both Yan's tic of tapping his fingers on things, and Ming's of tapping objects he's carrying against his leg as he walks, are plot points.
• The Chessmaster: loads, but especially Wong, Sam, Sam's wife Mary, Ming and the younger Ngai.
• Cloudcuckoolander: Keung has shades of this.
• Cool Shades
• Cowboy Cop
• Destination Defenestration:Wong's death
• Detective Mole
• Dirty Cop
• Everything's Louder with Bagpipes: played at cop funerals
• Gambit Pileup: all the films, but especially the plotting in the second film involving Wong, Sam, Sam's wife Mary, and Ngai Wing-Hau.
• Genre Shift: the first two films are gangster movies, the third is aMind Screw psychological horror.
• Going Native
• Here We Go Again: the third film ends with a flashback to the period of the first film that finishes with Yan and Ming unknowingly meeting each other in a hi-fi store - the scene that began the main action of the first film after an establishing pre-credit sequence.
• Hidden Wire
• Hired to Hunt Yourself: both Yan and Ming in the first film.
• I Know You Know I Know
• If I Can't Have You:Lau sold the first Mary out to the Ngais when she refused to return his romantic attentions.
• Internal Affairs
• Kansas City Shuffle
• Lady Macbeth: Sam's wife Mary.
• Likes Older Women:A younger Lau towards the first Mary, Sam's wife.
• Look Both Ways:the death of Sam's wife Mary
• Man On Fire
• Mexican Standoff
• Mind Screw
• Mob War
• The Mole: The two leads are the most obvious example.Keung and Shen were undercover cops, and Billy acts as a mole for the triads.
• Napoleon Delusion:in the third film Ming turns out to have gone insane and to believe that he is now Yang
• No, Mr. Bond, I Expect You to Dine: in a morally-inverted example, Wong likes doing this to Sam whenever he's arrested.
• One Steve Limit: exception with the two Marys
• Out-Gambitted
• Out with a Bang: the capo "Gandhi" in the second film.
• The Cuckoolander Was Right: All through the three films, Keung has always been the one to point out undercover cops. A few times, he has also made throwaway comments pointing to Yan as a cop.
• The Purge: the massacre of the Ngai capos in the second film.
• Those Two Guys: Del Piero and Keung in the first movie.
• Reverse Mole
• Revised Ending: the mainland China version of the first film ended with a different ending in whichMing gets caught, because of governmentMoral Guardians.
• Room Full of Crazy:
• The Shrink: Yan's therapist Dr. Lee.
• Sinister Shades
• Sunglasses at Night: Shen (and all the other sunglasses tropes on this page)
• Through the Eyes of Madness:most of the third film
• Xanatos Speed Chess

• Work
• Films of the 2000s
• The Infernal Affairs Trilogy
• Hong Kong Films
• Pages with working Wikipedia tabs
• Film
• Cult Classic