The forensics team and the crime team on Hong Kong's police force are challenged once again as the squad is staffed with new personnel. This time, the crime-solving police force led by Go Sir, Dr. Man, and King Sir, who all work together with their respective teams to solve murder mysteries.

Raymond Ho-Yin Wongas Ko On (Dr. Ko)
Selena Leeas Man Ka Hei (Dr. Man)
Alice Chan Waias Shui Wai Ming (Queen)
Shaun Tam Chun-Yinas Kwok Fai Wong (King Sir)
Rebecca Zhu Chenlias Ko Jing
Fred Cheng Chun-Hungas Charm Ting
Roxanne Tongas Tsui Yi (Chris)
Yumiko Cheng Hei-Yias Hau Man Li (Monique)
Gabriel Harrisonas Sze Kin Yin (Stan)
Patrick Tse Yinas Long Siu Tin