Go Mi Nyu (Park Shin-hye) is a sister-in-training. Her twin brother, Go Mi Nam (Park Shin-hye) successfully auditions for the musical band A.N.JELL but is forced to leave for the United States to correct a botched plastic surgery. Mi Nyu is approached by Mi Nam's manager to pose as Mi Nam while he recovers. She is against it at first but agrees in order to fulfill her dream of finding their mother. Now, posing as Mi Nam, Mi Nyu enters the group A.N.JELL and meets its members: Hwang Tae Kyung (Jang Keun-suk), Kang Shin Woo (Jung Yong-hwa) and Jeremy (Lee Hongki). At first, Tae Kyung does not like Mi Nam and makes her life hard, Shin Woo and Jeremy are friendly to her. Tae Kyung discovers that Mi Nam is a girl and threatens to reveal it, Shin Woo discovers it but does not reveal it and develops feelings for her. The story follows their lives away from the cameras and Mi Nam's efforts to keep her secret. Her life is made harder by Tae Kyung's initial hatred for her and the evil actress Yoo He Yi, who likes Tae Kyung


    Park Shin-hye as Go Mi Nam (Male) / Go Mi Nyu (Female)
    Jang Keun Suk as Hwang Tae Kyung
    Jung Yong-hwa as Kang Shin Woo
    Lee Hong Ki as Jeremy
    Uee as Yoo He Yi
    Kim In Kwon as Ma Hoon Yi (Mi Nam's manager- Manager Ma)
    Choi Ran as Go Mi Ja (Mi Nam & Mi Nyu's aunt)
      Jung Chan as President Ahn
    Choi Soo Eun as Wang Kko Di