Choi Gung-bong (Gong Yoo Yoo Gong) was drunk after attending a friend's farewell party. On the way back, he was harassed by a villain and was bravely helped by a righteous girl. After returning to school, Gung-bong met the rumored angel salesperson Lim Hyo-jin (Jeong-hwa Kim) at a hamburger shop and found that she was the girl who saved him that night. Gung-bong fell in love with Lim Hyo-jin at first sight and was hopelessly suffering from lovesickness because of this naturally beautiful girl. For this reason, he spent all his pocket money to buy a digital camera to follow Hyo-jin and uploaded her beautiful life photos to a social networking site called North Korean Spy. For a time, Hyo-jin became popular and surpassed Nam Jin-ah to become the number one on the website. The newspaper even reported it with the title "Those who don't know her are North Korean spies." However, this caused misunderstandings and dissatisfaction in Hyo-jin, because she was shy on the surface, but her true identity turned out to be a specially trained elite North Korean spy. In order to prevent her identity from being exposed, Xiaozhen dates Gaofeng to get close to him, in an attempt to get him to delete her photos from the website. During the dating process, the two gradually fall in love, but at this time Gaofeng receives a draft notice...