Yeo Ji-hoon tries to solve the mystery of old serial killer who has risen again. Nam Ye-ri is assigned to find a missing person. Baek Do-sik tries to uncover the cause of a supposed suicide. Could all their cases be linked?
The owner of bar is murdered in a villa in Gapyeong. She was the queen of power who knew the fatal secrets that can shake the political world. The chief of the National Police Agency secretly asks Ji Hun to do the case.