Anna Lin [Anna Lin] Psychology graduate student, 22 years old
Yan XunHun·Yancriminal psychology expert, 24 years old
Li Xu; Lin Anna's mentor, Yan Xun's old friend, 26 years old
Chen Kaile; Criminal Investigator, Serious Crime Team, Gudu City Public Security Bureau
Xu Li; Major Crime Team of Gudu City Public Security Bureau, forensic doctor, Lin Anna, and Yan Xun's common close friend