Sun-yul, a prodigy pianist who became the youngest-ever winner of the Van Cliburn International Piano Competition, loses both his family and the use of his hands in a devastating car accident on the night of a triumphant concert.

After spending over a decade living as an absolute recluse, a mysterious incident causes him to awaken inside the body of a seventeen-year-old boy.

Now possessing the body of 'Jung Sun-yul'—a notorious delinquent scorned and looked down on by everyone—he embarks on a second musical journey at his old alma mater.