Mi Nyeo has a twin brother, Mi Nam. They grew together at an orphanage. Mi Nam has been chosen to be a member of a boy band, but he can't work as a singer due to an accident. So Mi Nyeo pretends to be her brother and starts to live as Mi Nam, the idol singer. The boy band has three other members: Shin Woo, Tae Kyung, and Jeremy. Shin Woo is a musical genius and the most popular member. Unlike the artistic and sensitive Shin Woo, Tae Kyung is more like a businessman and is hardly moved by anything. And Jeremy is an optimistic person who gets along with everyone. Mi Nyeo, living as Mi Nam, has to work with them. However, she is not sociable as she has lived all her life cut off from the world. So living as an idol singer is hard for her.