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Infernal Affairs (2002)

Mou gaan dou (original title)
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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),


3,094 ( 131)
Top Rated Movies #223 | 23 wins & 21 nominations. See more awards »



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Cast overview, first billed only:
Chen Wing Yan (as Tony Leung)
SP Wong Chi Shing (as Anthony Wong)
Elva Hsiao ...
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


$6,428,966 (estimated)

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 referencing this film as the inspiration for the Best Picture-winning The Departed (2006), the announcer at the 79th Academy Awards mistakenly identified the Hong Kong production as Japanese. 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 »


SP Wong: Let me tell you a story. Two men need an organ transplant, but there's only one organ. So they play a game. They each put a card in their pocket. Whoever can guess the other's card wins the organ.
Sam: You know I can see your card.
SP Wong: I see yours as well.
See more »


References K-19: The Widowmaker (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

It has changed my expectation on crime drama forever
7 November 2005 | by (Canada) – See all my reviews

This movie has been regarded as the cream of Hong Kong gangster and cop movie. And has won 22 awards. But we all know awards don't mean a thing sometimes. The God Father of America cinema "Martin Scorsese" himself is making a American version of the movie, titled: Departed. I'm somewhat happy to see that this movie is being recognized and acknowledged by a true master, but distraught to the possibility of disappointment.

A little history of Hong Kong film industry, being in somewhat government free state for over 100 years, Hong Kong movie industry proliferated to the state of hysteria. On one hand, everything goes as long as people get what they want for 2 hours worth. On the other hand, lack of political drama has afforded the gangster and cop drama to truly grow and mature.

Now back to the movie itself. 3 years ago, when I was still a poor student, I was loitering in the local Chinese video store as usual, looking for something exciting. The owner handed me a VHS copy of this movie, he personally recommended it and said it's new and unique. So I went home and watched it immediately. And then I said in my then dark and dingy apartment for 30 minutes, in utter silence.

There was no plot twist, and no surprise ending, no Mr. M Night's heavy handed gimmicks and Hollywood's camera tricks. But from the beginning to the end, for full 2 hours, you can cut the tension with a knife. In the end, you still don't want it to end. The story goes on in your mind, questions, bits and pieces start to put together, characters start to take shape even after the movie ended.

In my entire life, I've never seen a movie that there isn't a single excessive frame, until I saw this movie. It has forever changed my expectation on crime drama.

The story is genius and simple enough. A mole in police department working against an undercover cop in drug trafficking mafia. They don't know each other's identity, so it is like a invisible tug war between the two competing against each other's wits. I won't reveal too much of it even though like I said, there's no plot twist.

It's a fairly popular movie that has generated huge buzz when it came out, and since been talked, compared and still highly regarded as unsurpassed by countless fans worldwide. It has an all star cast in Hong Kong cinema, and of course, the screenplay, the acting, the editing, the camera work and overall directing is flawless judging by all standards.

If you are adventurous enough to try even one Hong Kong movie, try this one.

217 of 243 people found this review helpful.  Was this review helpful to you?

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IA better than Departed charlesweisinger
Question about those of you who thought Infernal Affairs was better soccerdragon128
Why do you rate this movie with 1? Jordiuly
I liked The Departed better. wcpdrake
Saw Departed first? rjgates
GET THIS BACK IN THE TOP250 dan_brit_abroad
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