[2] [3] Sang-woo, the leader of college rock band Active Volcano, dies and sets up a reunion for Gi-yeong and the other members of the group.

Drummer Hyeok-su is a single father struggling to make a living as a car salesman.

One is a high school music teacher, Beom-jin, who has broken up with his girlfriend and now eats sadly alone in front of his mirror out of habit.

Another is the younger Sae-ki, whose mother left and whose father died in a sudden accident, leaving him an orphan.

In this rather dull world, the only thing that makes these two feel alive is music, offering them their "happy life".