Tae Joo, a former leader of the band, One Day, lives an unwilling and guilty like after losing co-member Ki Chan in an accident 15 years ago. Seung Pil, another member of the band, succeeds and becomes the director of a management that produces popular idols. Anna, from the group Tinkerbell under Seung Pil, can't sing or dance well and one day makes a serious mistake on live TV. Being criticized, Anna gets vocal training from Tae Joo and although they bicker and quarrel, they complete the song left unfinished by Ki Chan.