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

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Ratings: 8.1/10 from 84,077 users   Metascore: 75/100
Reviews: 185 user | 163 critic | 19 from

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?


The English title is a play on words mixing Ming's job in the IA, the infernal nature of both characters' double lives, and finally Dante's Inferno, relating to the original Cantonese title. See more »


When Lau goes to listen to the "sampler" CD that's been dropped off for him, he presses the button on the player and we see the CD drawer close twice - first in the long-shot, and then in a close-up that starts from a fully-open position on the drawer. See more »


Lau Kin Ming: I have no choice before, but now I want to turn over a new leaf.
Chan Wing Yan: Good. Try telling that to the judge; see what he has to say.
Lau Kin Ming: You want me dead?
Chan Wing Yan: Sorry, I'm a cop
Lau Kin Ming: Who knows that?
See more »


Referenced in Be Kind Rewind (2008) 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

Absolutely awesome
23 October 2003 | by (Glasgow, UK) – See all my reviews

A seriously refreshing police thriller that cranks up the tension to the max. There's no overblown gunplay or buddy cop crap here, this baby is tight as a drum and will have your nails down to the quick. Superb performances, a tight script and tense direction make this a winner in every department. Pick it up if you can, it's fantastic.



81 of 98 people found this review helpful.  Was this review helpful to you?

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