Placed in a quartet for an important concert, Youngjae wonders if he can work with his team.

His biggest headache is Jung Daehyun, the unfriendly, cold one-man show of a cello player.

Choi Junhong is the charming school prince and viola expert, whose popularity makes him absolutely intimidating.

Kim Himchan is the quiet senior who seems to be keeping a secret.

Where will Youngjae's journey lead him to?