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Infernal Affairs (2002)
"Mou gaan dou" (original title)

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Ratings: 8.1/10 from 84,388 users   Metascore: 75/100
Reviews: 185 user | 163 critic | 19 from Metacritic.com

A story between a mole in the police department and an undercover cop. Their objectives are the same: to find out who is the mole, and who is the cop.


(as Andrew Lau) ,


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Cast overview, first billed only:
Chen Wing Yan (as Tony Leung)
SP Wong Chi Shing (as Anthony Wong)
Kelly Chen ...
Elva Hsiao ...
Chapman To ...
Ka Tung Lam ...
Inspector B (as Lam Ka Tung)
Ting Yip Ng ...
Inspector Cheung (as Ng Ting Yip)
Dion Lam ...
Chi Keung Wan ...
Officer Leung (as Wan Chi Keung)
Hui Kam Fung ...


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. Written by Aya

Plot Summary | Plot Synopsis


Loyalty. Honor. Betrayal. See more »

Motion Picture Rating (MPAA)

Rated R for violence | See all certifications »

Parents Guide:



Official Sites:

| |  »



| |

Release Date:

12 December 2002 (Hong Kong)  »

Also Known As:

Infernal Affairs  »

Box Office

Opening Weekend:

$179,789 (Japan) (24 October 2003)


$89,594 (USA) (15 October 2004)

Company Credits

Show detailed on  »

Technical Specs


| (director's cut)

Sound Mix:

Aspect Ratio:

2.35 : 1
See  »

Did You Know?


When Yan and SP Wong are waiting at the elevator, the digital floor counter skips the 4th floor. In China and Hong Kong, the number 4 is considered bad luck because it sounds similar to the word 'death'. See more »


Changes in the time on the clock in the living room when the cop is listening to the CD that's been dropped off for him. See more »


Keung: Remember this, if you see someone doing something but at the same time watching you... then he is a cop.
See more »


Referenced in End Roll (2012) See more »


Infernal Affairs
Composed & Arranged by Ronald Ng
Performed by Andy Lau and Tony Chiu Wai Leung (as Tony Leung)
Produced by Ronald Ng and Jacky Chan
O.P. BMG Music Publishing Hong Kong, Ltd./Catchy Music Publishing, Ltd.
See more »

Frequently Asked Questions

See more (Spoiler Alert!) »

User Reviews

A textbook thriller
9 November 2006 | by (Saffron Walden, UK) – See all my reviews

A deceptively simple idea lies at the heart of this complex thriller: the Hong Kong police and a triad gang both have an informer in each other's organisation: whoever's man picks the enemies' spy first wins the game for his side. Add to that the customary double-agent-doesn't-know-which-side-he-is-on-anymore subplot (doubled, of course), and you have plenty of ingredients for a plot, although it's to the movie's credit that although a little stylised, it never seems false or contrived. Fast-paced and bold, with a generous score, it never insults the viewer's intelligence either, and features just the right level of moral ambiguity. At one level, it's just another thriller, and there's little in the way of wider political or social subtext; but on the other hand, it's a textbook lesson in the art of making this sort of film.

31 of 41 people found this review helpful.  Was this review helpful to you?

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