A man in a black sedan keeps murdering young people who are just about to join the work force. RIU Team One finds a survivor and asks for her help. Unlike his usual self, Hyun Jae passionately helps out the survivor to remember the case. Meanwhile, the detectives are trying to find the secret behind “4789”.
Elenco: Jang Hyuk , Choi Soo-young , Jin Seo-yeon , Ryu Seung-su , Jang Hyun-sung .