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.
Alex Fong Chung-Sun
Ram Chiang Chi-Kwong
Cheung Kwok-Keung
Ben Wong Chi-Yin
Cayley Mak Ho-Yee
Yoyo Mung Ka-Wai
Lee Shing-Cheong
Edwin Siu
Oscar Leung Lit-Wai
Christine Kuo Yun-Hui
Lee Tin-Cheung
Power Chan Kwok-Pong
Océane Zhu
Tavia Yeung
Jimmy Au Shui-Wai
Chiu Lok Yin
Wallace Huo
Oscar Chan Yat-Tin
Lau Kong
Leanne Li
Aimee Chan
Yu Chi-Ming