A former police officer gets dragged into a game of cat and mouse initiated by an intelligent killer to punish criminals outside the law.
Kwok Man Bun / Zero / Kwok Man Shing
May Chou
Wong Sir
Lee Wai Lam
Kevin
Ma Tong Tat
James
Chor Hei
Director of the Orphanage
Peter
Lawyer
Wang Zhe
May's Father
May Chou's Mother
Nurse Chan
Kwok Man Bun / Zero / Kwok Man Shing
May Chou
Wong Sir
Lee Wai Lam
Kevin
Ma Tong Tat
James
Chor Hei
Director of the Orphanage
Peter
Lawyer
Wang Zhe
May's Father
May Chou's Mother
Nurse Chan