Ahn Joong-Hee is an actor who used to be a member of an idol group. One day, he appears in front of a family who consists Byun Han-Soo and Na Young-Sil and their 4 children including Hye-Young and Mi-Young. Joong-Hee begins to live wth them.

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.