張可頤
Senior Forensic Chemist "Jack Po" (Wayne Lai), better known as "Pro Sir", is the head of the Forensic Science Department and is skilled at analysing criminal psychology. He has a unique view on human nature and is familiar with the structure of various firearms. Pro Sir works closely with Senior Forensic Pathologist "Mandy Chung" (Maggie Cheung Ho-yee) in a wide range of fields including psychology, anthropology, criminology and forensic science.