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

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Ratings: 8.1/10 from 84,239 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


". . . choose how to live the rest of your life.: Inspector Lau Min Ming 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: [raising his hands to police officers] I'm a cop.
See more »


References Eight Legged Freaks (2002) See more »


The Forgotten Time
Composed by Chen Hong Ming
Lyrics by Chen Hong Ming
Performed by Tsai Chin
See more »

Frequently Asked Questions

See more (Spoiler Alert!) »

User Reviews

more than just entertaining
9 March 2005 | by (Canada) – See all my reviews

This movie is well-made, stylish and extremely entertaining. However, as stated by the review from a Hong Kong viewer, there is also depth and subtlety rarely found in action/thrillers. It is this depth that makes this movie brilliant. The depth of this movie is best served by the understated yet deeply moving performances of the main characters. Viewers are allowed into the inner changes of these characters and before long, the viewers begin to care about them, be it the "good guy" (Yan) or the "bad guy" (Ming). The rest of cast successfully relate the complicated and exciting plot to the viewers, and all the supporting performances are almost flawless, perhaps with the exception of the female psychologist who seems sadly one-dimensional. I grew up in Hong Kong but has since lived most of my life in Canada. With this duo-cultural background, I have mixed feelings about the Hollywood remaking of this movie. On the one hand, I am happy for the Hollywood recognition of this great movie by remaking it. On the other hand, I would hate to see how badly sabotaged the end result would be. Some things just do not translate. As a minimum, I hope the great director Scorcese will make good use of the major plot line and generate a haute thriller and with the excellent cast, develop some in-depth characterization. The Chinese philosophy and the spirit of the original film is better left undisturbed.

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