高美男和高美女是双胞胎，父母早逝之后被姑姑送到天主教会的育幼院。哥哥离开到外面闯天下，妹妹则留在修道院预备当一名修女。哥哥被选为当红偶像团体A.N.JELL的新成员，但却因整型失败无法如期出现签约或参与活动。
经 纪人马克来到教堂找美女，希望美女能够帮助双胞胎哥哥度过难关，暂时假扮成哥哥高美男。十分为难的美女勉强答应前往A.N.JELL公司帮哥哥签约，也 正式见到了黄泰京、姜新禹、Jeremy三名团员。在众人质疑的状况下，美女用天籁一般的声音说服了所有人，也完成了签约仪式。只是，她万万没想到， 马克要她做的不仅仅是签约，还要跟着三名团员一起生活、练唱。
因为想帮助哥哥完成心愿，也想藉此找回失散多年的母亲，所以决定代替哥哥加入乐队。就这样，高美女化身为高美男住进入A.N.JELL宿舍，却没想到一住进去后，马上惹火了有洁癖的黄泰京， 在团队里也发生一连串的趣事。

SYNOPSIS

Gao Mei Nan and Gao Mei Nŭ are a pair of twins raised in an orphanage when they lost their parents at a tender age. Gao Mei Nan is about to ink a contract to join idol group A.N.JELL but is forced to travel and correct a botched plastic surgery. Gao Mei Nŭ is a sister-in-training when Mei Nan’s manager approached her to pose as Mei Nan while he recovers.  Mei Nŭ is hesitant at first but finally agrees only to fulfill her brother’s dream to fame which would also make it easier to find their mother.
Assuming the identity as Gao Mei Nan, Mei Nŭ meets A.N.JELL members: Huang Tai Jing, Jiang Xin Yu and Jeremy. Not only did she successfully pull off the pretense, she also convinced the members with her vocal capabilities. The impersonation continues as she moves in to live with her fellow members but leader of the group, Tai Jing begins to make her life difficult.