Seung Hee and Hyun Jun are reunited. But the terrorists force Hyun Jun to interrogate her for information. Meanwhile, it has finally been informed to everyone that the terrorists plan to use the nuclear bomb in Seoul during the reunification meeting of the North and South.

Park Chul Young joins Hyun Jun and an unknown organization to stop the terrorist attack on Seoul. But first, they must track down the bomb. Meanwhile, IRIS is beginning to take control of the NSS.