Kang Du Won, the man who tried to blow himself up at the Samsu Subway Station, reveals that the man who had tricked him in doing what he did is an officer of the Poongsan Violent Crimes Division. With this new information, and despite Kang Kwon Joo’s disbelief, Do Kang Woo narrows his suspicions to Chief Na Hong Soo and starts to tail him. Meanwhile, internal affairs bust Agent Jin while he hacks into the E-Secret database to do a background check on Chief Na Hong Soo. (Source: Viu)