Jung Bong-ki, a below-average guy in his 20s, wakes up from sleep and discovers he has become a glamorous and beautiful girl! Then, the entire world becomes kind to him, no, her. As Bong-gi lives a new life as A-reum, Sang-woo, his high-school friend, gets a part-time job at a convenience store where he works. Bong-ki blames Sang-woo for his leg injury that led to him giving up his dream of becoming an athlete. So, she plots revenge, giving him a heartache of betrayal.