Han Sae Bik, who has a beautiful singing voice, wishes to be a famous singer in South Korea. She moves to Seoul along with her family in order to fulfill her dream. However, she fails in all 48 singing auditions not because of her talent but her unconventional style.
Her family, especially her grandfather, is strongly opposed to her dream, forbidding her from becoming a singer because of the thought that it's not a proper job for a person born into a traditional house. When Sae Bik falls asleep in a hairdresser's, she gets her hair cut just like a handsome boy. She participates in a singing contest in order to earn money for a wig. She is mistaken to be a boy and wins the contest. An entertainment agency notices her and asks her to be in a boy band with other 4 members. The story now begins.