Choi Sooyoung ,17 years, has everything a girl wants. She's rich, tall and pretty, intelligent, has a nice personality and is popular with almost every boy and girl at her school. As one of the top students everyone expects her to be a famous lawyer, doctor or instructor like her father. But for Sooyoung, music is her life. Her dream is being one of the most famous singer in the Korean music industry. But because of all  the exspectations of her family and friends, she can only secretly pursue her dream.

Cho Kyuhyun, 17 years old, is one of Sooyoung's classmates. Coming from a poor family he doesn't really like Sooyoung who always seems to be happy. For him only music and his little sister Sulli (8 years old) count, so he's always sleeping during school and works in the afternoon to make a living.

But what happens, if Kyuhyun finds out about Sooyoung's secret of being a member in a girl group, but with a false name and a wig? Will he tell everyone about her secret or is he going to keep it for himself?