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

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Ratings: 8.1/10 from 85,491 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:

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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 »


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 Simply Actors (2007) See more »


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

Frequently Asked Questions

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User Reviews

One of the best from Hong Kong
19 April 2006 | by (Australia) – See all my reviews

This movie should be compared to movie like Heat, even when the storyline are not the same. Movies like Hardboiled and A Better Tomorrow are predominately action-based, whereas this movie is more dramatic and emotionally-driven.

The main attraction is the mole hunts but it would not be as brilliantly done if not for the fireworks between the major characters.

The title from the explanation in the intro means "Endless Purgatory Road". This philosophy, to me, really made this movie more thoughtful. The two central characters both had to walk their road, in life and in their minds for a long time. Both had no choice but to keep walking. As they cross path, they were forced to play the game of cat and mouse by their superiors. While it is not certain who's the cat and who's the mouse, one thing is certain - the loser will die.

While there are four main characters, they are all males. This should be bad for any movie but I think this is one of the exception to the rule. The emotions and tension between the four were well-scripted and brilliantly played. It is no surprised each had at least one best actor awards in the Hong Kong industry. The sequels(2 prequels) will delve deeper into it.

Plotwise - it is hard to see any holes.

Seen it around six times, a lot for a drama.

I think you should ask yourself after the movie, "what would I do if I am in the same situation?". Right and wrong is harder to separate.

60 of 72 people found this review helpful.  Was this review helpful to you?

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Eric Tsang better than Jack Nicholson as the villain WheezePuppet
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