Park Sang Hyun and Seung Hee are beginning to suspect Sa Woo and Baek San of being traitors. Park Chul Yung is starting to have second thoughts about the nuclear attack. Meanwhile, Hyun Jun informs the South Korean President about IRIS.

The President has ordered Eun Gi Hoon's arrest. But when he turns up dead, the President orders Sa Woo and Baek San's arrests. Meanwhile, HyunJun, Sun Hwa, and Chul Young try to locate the nuclear bomb before it goes off at 5pm.