When one of your best friends joins a band and becomes depressed, how far will you go to help him? A childhood nightmare, a new family, a new life. Seunghyun had always been there, a part of your life. What will happen when he needs you next?

What happens when Jieun is assigned to one of the most popular and most wanted boys in school — Jang Wooyoung, as a music partner for one year?