Infernal Affairs ()

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.


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Inspector Lau Kin Ming
Chen Wing Yan (as Tony Leung)
SP Wong Chi Shing (as Anthony Wong)
Hon Sam
Dr. Lee Sum Yee
Young Lau Kin Ming
Young Chan Wing Yan
Tsui Wai-keung
Inspector B (as Lam Ka Tung)
Inspector Cheung (as Ng Ting Yip)
Del Piero
Chi Keung Wan ...
Officer Leung (as Wan Chi Keung)
Hui Kam Fung ...
Cadet School Principal
Stereo Shop Owner
Hin-Wai Au ...
Double 8 (as Li Tin Cheung)
Wong Yin Keung ...
CIB Team
Lam Po Loy ...
CIB Team
Wing Yee Cheng ...
CIB Team
Man-Kei Yiu ...
CIB Team (as Man Kee Yiu)
Yuen Waj Ho ...
CIB Team (as Yuen Wai Ho)
Wai-Kwok Mak ...
CIB Team
Kui Mei Yee ...
CIB Team
Chi-Wang Wong ...
CIB Team (as Wong Chi Wang)
Lee Yip Kin ...
Sam's Follower
Chung Wai Ho ...
Sam's Follower (as Ho Chung Wai)
Sam's Follower (as Yu Sai Tang)
Kam Hung Wong ...
Sam's Follower
Sam's Follower
Chi-Wai Lai ...
Sam's Follower (as Lai Chi Wai)
Jerry Leung ...
Sam's Follower (as Leung Ho Kei)
Tze-Ming Lee ...
Sam's Follower
Hui On Tat ...
Officer Chan
Ho Wing Ling ...
Wah-Chu Lee ...
Chief Inspector
Cadet School Instructor
Chiu Yi Leung ...
May's Daughter
Chaucharew Wichai ...
Sunny, Thai Drug Dealer
Rest of cast listed alphabetically:
Wai-Ho Yuen ...
CIB Officer

Directed by

Andrew Lau
Alan Mak

Written by

Alan Mak ... (written by) &
Felix Chong ... (written by)

Produced by

Ellen Chang ... line producer
Elos Gallo ... consulting producer
Lorraine Ho ... line producer
Andrew Lau ... producer

Music by

Kwong Wing Chan ... (as Chan Kwong Wing)
Ronald Ng ... composer

Cinematography by

Yiu-Fai Lai ... director of photography
Andrew Lau ... director of photography

Film Editing by

Curran Pang ... (as Pang Ching Hei)
Danny Pang

Editorial Department

Royce Smith ... film color timer (uncredited)

Art Direction by

Sung Pong Choo ... (as Choo Sung Pong)
Ching-Ching Wong

Costume Design by

Pik Kwan Lee ... (as Lee Pik Kwan)

Makeup Department

Yu-Lai Cheng ... makeup artist (as Cheng Yu Lai)
Wai Hing Lau ... hair stylist (as James Lau)

Production Management

Wendy Chan ... assistant production manager
Lai-Yin Chow ... unit manager
Bonnie Shum ... assistant production manager
Wai-But Tang ... post-production supervisor
Ronald Wong ... production manager

Second Unit Director or Assistant Director

Steve Chan ... first assistant director (as Chan Wai Hung)
Dickson Leung ... second assistant director

Art Department

Hung Chin Lau ... assistant art director (as Lau Hung Chin)
Wai-Ming Wong ... property master (as Wong Wai Ming)

Sound Department

Wing Lai Chin ... sound mixer (as Chin Wing Lai)
Felix Sze Ming Chung ... assistant mix engineer / music editor / sound effects editor
Wai Hung Kwong ... foley artist (as Kwong Wai Hung)
George Yiu-Keung Lee ... dialogue editor (as George Lee Yiu Keung) / re-recording mixer (as George Lee Yiu Keung)
Tin Sung Ng ... boom operator (as Ng Tin Sung)
Burnard To ... foley recordist (as To Burnard)
Kinson Tsang ... re-recording mixer / sound designer
Tse Kin Wong ... dialogue recordist (as Wong Tsz Kin)
Chun Hin Yiu ... dialogue recordist (as Yiu Chun Hin)
Ting Yip Yuen ... dialogue recordist (as Yuen Tin Yip)
Mark Kenna ... consultant: Dolby film sound (uncredited)

Special Effects by

Kam Tong Fok ... pyrotechnician (as Fok Kam Tong)

Visual Effects by

Chris Chan ... animator
Eddie Cheng ... project supervisor
Francis Fung ... visual effects editor
Hin-Pun Ho ... animator (as Ho Hin Pun)
Jesse Ho ... animator
Harry Ching Wei Hung ... lighting and texture artist: Menfond Electronic Art
Keith Leung ... digital compositor
Cons Li ... visual effects coordinator
Eddy Wong ... visual effects supervisor
Peggy Wong ... visual effects coordinator
Victor Wong ... visual effects supervisor
Ray Wu ... visual effects editor


Dion Lam ... stunt coordinator

Camera and Electrical Department

Man Keung Cho ... focus puller (as Cho Man Keung)
Kin-Kwong Ho ... focus puller (as Ho Kin Kwong)
Wing Cheung Kwan ... focus puller (as Kwan Wing Cheung)
Raymond Lam ... steadicam operator
Tat-Wah Tam ... still photographer (as Tam Tat Wah)
Chi-Ming Wong ... gaffer (as Wong Chi Ming)
Wang-Fai Wong ... still photographer (as Wong Hung Fei)

Costume and Wardrobe Department

Man Kit Chow ... wardrobe assistant
Rosa Chow ... assistant costume designer
Yun Mei Man ... wardrobe (as Man Yun Mei)

Music Department

Clement Fung ... orchestral arrangements
Fiona Fung ... soloist
Po Shek Tam ... musician: bamboo flageolet

Script and Continuity Department

Henry Lau ... continuity

Additional Crew

Man-Ying Cheung ... executive planner
John Chong ... presenter
Christopher Doyle ... visual consultant
Lorraine Ho ... executive planner
Andrew P. Kirkham ... bluray producer [gb]
Calmen Lui ... laboratory consultant
Sam Lung ... production assistant
Nansun Shi ... presenter
Leo Sze ... production accountant
Yung-Lin Yeung ... tea lady

Production Companies




Special Effects


Other Companies



Plot Summary

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 Keywords
Taglines Loyalty. Honor. Betrayal. See more »
Parents Guide View content advisory »

Additional Details

Also Known As
  • Wu jian dao (Hong Kong, Mandarin title)
  • Non-Stop Way (Hong Kong, English title)
  • Mou Gaan Dou (Canada, English title)
  • Infernal Affairs (United States)
  • Infernal Affairs (World-wide, English title)
  • See more »
  • 101 min
Official Sites
Aspect Ratio
Sound Mix
Filming Locations

Box Office

Budget $6,428,966 (estimated)
Cumulative Worldwide Gross $8,708,932, 21 Oct 2004

Did You Know?

Trivia 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 »
Goofs Shawn Yue (Young Chen Wing Yan) is taller than Anthony Chau-Sang Wong (SP Wong Chi Shing), and there is a brief shot of them standing together. Tony Chiu-Wai Leung (Chen Wing Yan) is clearly shorter than Anthony Chau-Sang Wong, so the character has apparently shrunken. See more »
Movie Connections Edited into Infernal Affairs III (2003). See more »
Soundtracks Infernal Affairs See more »
Quotes 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 »

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