While a serial killer confessed to the crime, who was a mysterious victim of TJ Group's Legal Team, who was not a serial killer. Kang Chang -chang (Son Hyun -joo) X Oh Ji -hyuk (Jang Seung -jo), who began to investigate the characters around Chung Hee -ju. Meanwhile, Woo Tae -ho (Jung Moon -sung) finds the victim Jung Hee -ju's grandfather.