Senior Forensic Chemist Jack 'Pro Sir' Po is the head of the Forensic 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 Pathologist Mandy Chung in a wide range of fields including psychology, anthropology, criminology and forensic science.

Wayne Lai Yiu-Cheungas Po Kwok Tung (Jack / Pro Sir)
Maggie Cheung Ho-Yeeas Chung Hok Sum (Mandy)
Kate Tsui Tsz-Shanas Ling Sin Yee (Ada)
Ron Ng Cheuk-Haias Lee Chin Fung (Wind)
Nancy Wu Ting-Yanas Chow Yik Fei (Eva)
Aimee Chanas Chiang Cheuk Kwan (Angel)
Edwin Siuas Ho Ching Man (Ken)
Ram Chiang Chi-Kwongas Yau Kin Po (Paul)
Geoffrey Wong Chi-Hungas Jason Ko
Yuen Wahas Po Shun Hing