
Dr. Ko Lap-yan heads a team of senior psychiatrists and residents at the Yan Wo Hospital in Hong Kong. Most episodes revolve around the team diagnosing patients. With a specialty at diagnosing criminals, Ko also has close ties with the Serious Crime Unit of the Hong Kong Police Force, a unit headed by Senior Inspector Chung Kwon-ban. The second series sees Ko's resignation from the Yan Wo Hospital; he is later transferred to a new psychiatric department, the Forensics Psychiatry Department, of Bok On Hospital, where he formally diagnoses criminals.

as Yuen Man Hon

as Ko Sau Yee

as Cheng Sum Yau

as Lee Tsz Yan

as Chan Kwong Leung

as Suen Ka Pik

as Lui Wing Chi

as Lee Ying Chun

as Chan Mei Kuen

as SIP Chung Kwok-ban

as WPC Mandy M.Y. Mok

as Dr. Leo Fong Wing-chun

as 高立仁

as 菲比斯

as Yu Kwan Wai