 Lau Ching-WanInspector Chan Kwai Bun | Inspector Chan Kwai Bun |
 Andy On Chi-KitInspector Ho Ka-on | Inspector Ho Ka-on |
 Gordon Lam Ka-TungKo Chi Wai | Ko Chi Wai |
 Kelly Lin Hsi-LeiMay Cheung | May Cheung |
 Karen Lee Choi-LingGigi | Gigi |
 Joseph Lee Kwok-LunWong Kwok Chu | Wong Kwok Chu |
 Eddie Cheung Siu-FaiViolent Man - Ko's Inner Personality | Violent Man - Ko's Inner Personality |
 Lam SuetFatso - Ko's Inner Personality | Fatso - Ko's Inner Personality |
 Jay Lau Kam-LingCalculating Woman - Ko's Inner Personality | Calculating Woman - Ko's Inner Personality |
| JJeff Cheung Ka-KitKo's Inner Personality | Ko's Inner Personality |
 Lu Ching-TingKo's Inner Personality | Ko's Inner Personality |
 Chiu Chi-ShingKo's Inner Personality | Ko's Inner Personality |
 Hung Wai-LeungKo's Inner Personality | Ko's Inner Personality |
 Flora Chan Wai-ShanMay Cheung in Bun's Eyes | May Cheung in Bun's Eyes |
 Jonathan Lee Yat-SingWeak Boy - Ho's Inner Personality | Weak Boy - Ho's Inner Personality |
 Jo Kok Cho-LamSchemy Woman - Ho's Inner Personality | Schemy Woman - Ho's Inner Personality |
 Eddy Ko HungThe Chief | The Chief |
 Yuen Ling-ToPoliceman | Policeman |
 Jimmy Wong Wah-WoRestaurant Manager | Restaurant Manager |
 Ronald Yan Mau-KeungChi-Wai's Boss | Chi-Wai's Boss |
| AApple Chow Suk-Wai7-11 Worker | 7-11 Worker |
 Jackson Ha Chak-ShunKo's Colleague | Ko's Colleague |
 Jack Lai Jan-LungKo's Colleague | Ko's Colleague |
 Singh Hartihan BittoNaresh Sharma | Naresh Sharma |
 Wong Shiu-KeungPoliceman (uncredited) | Policeman (uncredited) |
 Lui Siu-MingMahjong Parlour's Staff (uncredited) | Mahjong Parlour's Staff (uncredited) |
 Mark Cheung Yiu-FaiMahjong Parlour Customer (uncredited) | Mahjong Parlour Customer (uncredited) |
 Soi CheangInspector Ho Ka-on (voice) | Inspector Ho Ka-on (voice) |
 Florence Kwok Siu-WanMay Cheung (voice) | May Cheung (voice) |
 Peter Chan Bei-DakCameo (picture in police file) | Cameo (picture in police file) |
