UHM Cheol-woo, the former agent of the North Korean National Security, escapes to South Korea with No. 1 of North Korea who has been injured due to the coup of hard-liners against North Korea. One day, UHM comes across KWAK Cheol-woo, an acting chief of foreign security affairs of the Blue House and they realize they have to cooperate and proceed with a dangerous secret spy mission together in order to prevent the Korean war.