You are beautiful:

Tae Kyung and On Yu are in search of a new member for their idol group, A.N.JELL. However, Mi Nam suffers an injury at the last moment, preparing for a concert. So Mi Nyu, his twin sister (beautiful girl), is asked to step in for her brother. The rest of the drama follows the behind-the-scenes life of an idol group where Tae Kyung fall in love with Mi Nyu.

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