Rebellious Ki-soo from North Korea is mesmerized by tap dance in prison camps. Ki-soo joins as a team member of a dance team named ‘Swing Kids’. Yet suddenly, their dreams about dancing in prison camps are put in danger.

As a North Korean sleeper cell agent, Ryu-han infiltrates the South and assumes the role of a village idiot in a rural town. He observes the townsfolk and waits patiently for his mission. One day, after 2 years of playing the role of the village idiot, fellow elite spies Hae-rang, posed as a rock star and Hae-jin, posed as an ordinary student, are dispatched to the same town as Ryu-han. He helps the other two spies settle in and teach them how to adjust in the South. There is a sudden drastic political power shift in the North and all three spies receive an urgent and ultimate mission.