Ji Hyuk tries to find out who at the agency received the last emergency call from Dandong. To find out, he attempts to retrieve intel from the main server of the NIS. However, the server gets hacked by an unknown hacker, and the intel falls from his grasps. He chases down the hacker to regain fragments of his memory.

New truths unfold as Ji Hyuk investigates Seo Su Yeon. While he digs into Su Yeon, he gets faced with a new enemy when his partner Je Yi gets kidnapped. Meanwhile, a North Korean defector's testimony raises questions of its validity surrounding an ongoing espionage case.

Baek Mo Sa begins to stand in front of his operations to make his objective come to life. Han Ji Hyuk and his colleagues gear up to stop Baek Mo Sa's plans. However, they face his wrath as they enter his hideout.

Ji Hyuk and Je Yi become isolated from help. It's up to just the two of them to stop Baek Mo Sa's terrorist act and save the lives of innocent hostages trapped inside a building. With the hope that a little bit of Yoo Joon Man still exists inside him, Ji Hyuk and Je Yi go after Baek Mo Sa.