Han Ji-soo (Kim Ah-joong) is a popular star who is deeply loved by the people, but her original intention of entering the entertainment industry was to earn medical expenses for her seriously ill mother. Ji-soo's boyfriend, Kim Kang-mo (Zhou Sang-wook), helped Ji-soo a lot along the way. Although their relationship can only be maintained underground, their feelings are indeed very deep. Unfortunately, in order to take into account her father's election, Kang-mo is engaged to the eldest daughter of a chaebol family. With this idea in mind, Ji-soo found an ordinary postman, Gu Dong-baek (Hwang Jung-min), who she met by chance, to become her "fake boyfriend." Gu Dong-baek is an honest and shy man. The sudden appearance of a "superstar girlfriend" around him has brought a storm to his ordinary life. What kind of story with laughter and tears is waiting for the two?