陳奕迅

Det. Sgt. Major Gale

Tony Leung Ka-fai

Chief Sgt. Major. Lak Chui

Anthony Wong Chau-sang

Unicorn Tang

Lik-Sun Fong

Bong

林保怡

Inspector Yin

徐子珊

May

Young Liu

Rose

孟瑶

Unicorn's Girlfriend

鮑起靜

Bong's Mother

Wong Jing

Gold / Mr Chu