Dr. Kim Myung Guk has been missing for three years. Ever since a terrorist organization tried to capture him for his development on nuclear weapons. But now, the National Anti-Terror Service (NTS) has information that the organization has found him.
Lee Jung-Woo is on temporary leave from NTS. He heads to Japan to solve a missing clue that Dr. Kim Myung Guk left behind before his death. Son-Hyeok orders Hye-In to follow Jung-Woo and kill him. But will Hye-In's feelings get in the way?
Dr. Kim Myung Guk has been kidnapped and the NTS have no leads on his whereabouts. Meanwhile, Jung-Woo and Jae-Hee are sent to Japan to protect Korean pop star, BoA, from a terrorist threat.
Son-Hyuk and the DIS are requested to move their offices into NTS. Hye-In plans to use Jung-Woo's desire for her to gather classified information for the DIS.
With the President's daughter kidnapped, the NTS must join forces with Son-Hyuk and his men in order to get her back without giving the terrorist what he wants.
The SNC has been recovered. But now, Athena wants it back. They force Jung-Woo to get it back for them while holding Hye-In hostage. With Ki-Soo's help, Jung-Woo recovers the SNC and kills the terrorists. But his career with the NTS could be in jeopardy.
Jung-Woo believes that Hye-In was the sniper that killed Han Jung Pil and he holds himself responsible for how his death has effected Jae-Hee. Meanwhile Athena prepares for an attack on the President before his meeting with Saudi Arabia.