Cast & crew
Mad Detective (2007)
Directed by Wai Ka-Fai, Johnnie To Written by Au Kin-Yee, Wai Ka-Fai
Cast
| Lau Ching-Wan | Inspector Chan Kwai Bun |
| Andy On Chi-Kit | Inspector Ho Ka-on |
| Gordon Lam Ka-Tung | Ko Chi Wai |
| Karen Lee Choi-Ling | Gigi |
| Joseph Lee Kwok-Lun | Wong Kwok Chu |
| Kelly Lin Hsi-Lei | May Cheung |
| Eddie Cheung Siu-Fai | Violent Man - Ko's Inner Personality |
| Lam Suet | Fatso - Ko's Inner Personality |
| Jay Lau Kam-Ling | Calculating Woman - Ko's Inner Personality |
| Jeff Cheung Ka-Kit | Ko's Inner Personality |
| Lu Ching-Ting | Ko's Inner Personality |
| Chiu Chi-Shing | Ko's Inner Personality |
| Flora Chan Wai-Shan | May Cheung in Bun's Eyes |
| Jonathan Lee Yat-Sing | Weak Boy - Ho's Inner Personality |
| Jo Kok Cho-Lam | Schemy Woman - Ho's Inner Personality |
| Hung Wai-Leung | Ko's Inner Personality |
| Eddy Ko Hung | The Chief |
| Yuen Ling-To | Policeman |
| Jimmy Wong | Restaurant Manager |
| Ronald Yan Mau-Keung | Chi-Wai's Boss |
| Apple Chow Suk-Wai | 7-11 Worker |
| Jackson Ha Chak-Shun | Ko's Colleague |
| Jack Lai Jan-Lung | Ko's Colleague |
| Singh Hartihan Bitto | Naresh Sharma |
| Wong Shiu-Keung | Policeman (uncredited) |
| Lui Siu-Ming | Mahjong Parlour's Staff (uncredited) |
| Mark Cheung Yiu-Fai | Mahjong Parlour Customer (uncredited) |
| Soi Cheang | Inspector Ho Ka-on (voice) |
| Florence Kwok Siu-Wan | May Cheung (voice) |
| Peter Chan Bei-Dak | Cameo (picture in police file) |
Crew
| Raymond Chan Kam-Ho | Production Design |
| Wai Ka-Fai | Director |
| Johnnie To | Director |
| Martin Richard Chappell | Sound Designer |
| Chiu Chi-Shing | Unit Manager |
| Charles Heung | Executive Producer |
| Kuk Kok-Leung | Line Producer |
| Au Kin-Yee | Screenplay |
| Wai Ka-Fai | Screenplay |
| Johnnie To | Producer |
| Cheng Siu-Keung | Director of Photography |
| Raymond Chan Kam-Ho | Art Direction |
| Tina Baz | Editor |
| Wai Ka-Fai | Producer |
| Xavier Jamaux | Original Music Composer |
| Stanley Cheung Sai-Kit | Costume Design |
| Midco Chu Wai-Fong | Makeup Artist |
| Mark Garbarino | Makeup Artist |