Yu-jun is a promising pianist who had been studying abroad. On the other day, however, he gets a wrist injury and no longer be able to play piano due to the aftereffects. To concentrate on his treatment, he returns home as an exchange student at the college of music in Korea where his father teaches. Then one day, Yu-jun has a chance meeting with Jung-a while she plays a mysterious piece in an old practice room on campus. As they spend more time together, they develop feelings for each other. However, unlike Yu-jun, who wants to get closer, Jung-a repeatedly pulls away and confuses him with her secretive actions. Searching for Jung-a’s whereabouts when she vanishes one day, Yu-jun comes across Jung-a’s hidden secret.