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.
| Production | Mui Siu-Ching | Producer |
| Directing | Mui Siu-Ching | Director |
| Writing | Tessa Choy Ting-Ting | Writer |
| Writing | Ching-yee Chan | Writer |
