Bosco Wong
Hui Wai-Sam (Bosco Wong) is a Witness Protection Unit (WPU) officer whose team is assigned to protect the cellist Hailey Kiu Chi-Lam (Linda Chung), the daughter of a wealthy businessman Kiu Kong-San (Paul Chun), when Chi-Lam witnesses the assassin who attempted to kill Kong-San's brother Kiu Kong-Ho.