송승헌

Sung-jin

조여정

Su-yeon

박지현

Mi-ju

박지영

Hye-yeon

박성근

Office manager

Kim Mi-kyeong

Sung-jin's mother

변중희

Ms. Park

박영준

Deputy concertmaster

주예린

Su-yeon's friend

이소영

Su-yeon's friend

고나영

Su-yeon's friend

손은호

Su-yeon's friend

Yoon Se-woong

Plumber

심우성

Detective

오누리

Orchestra employee

Lee Moon-bin

Chef

손주환

Driver

Shin Jae-young

Old woman

Kim Yu-na

Eun-bi

서문호

Detective 1