Two years ago, North Korea's 5446 secret special unit sent Yuan Yoo-hwan (Kim Soo-Hyun), head of the five-star team, to sneak into a South Korean village to act as a spy. Yuan, under the pseudonym Fang Dongjiu, settled at the home of a stingy aunt as a fool. He knew the history and movements of everyone in the village, and at the same time, he often had to do silly and ironic things in order not to show his feet. With the death of Kim Jong Il, the motherland seems to have changed a little. At that time, the black dragon group leader Li Hailang (Park Ki-hsiung), who competed with Yuan, and the younger generation Li Haizhen (Li Xianyu), who regarded Yuan as his mentor and benefactor, appeared in the village one after another. The lonely Dongjiu will be himself a little in front of the two comrades, and the coldness in his heart will slowly change when he gets along with the people of the "enemy country". One day, an order against the spies of Unit 5446 came, and the fate of the three young men ushered in the most severe pass.