Louis Koo (Ho Kwok-fai, The Brain) Richie Ren (Chan Fong-chow) Shui-Fan Fung (Uncle) Michelle Ye (Woman) Suet Lam (Fatty) Alexander Chan (Wong) Yuqin Han (Chan Fong-chow's wife) Cheung Wing Lai (Wong's Father) Peter Lau (Trad Boss) Frank Michael Liu (Police Detective (as Chung Kei Lau)) Siu Kwan Lui (Shopkeeper) Sherwin Ming (Client)