The Sound of Your Heart

Park Soo-oh

Jo Joon (young)

Kwang-Soo Lee

Cho Seok

Dae-Myung Kim

Cho Jun

Jung So-Min

Ae-bong

Kim Byeong-Ok

Cho Cheol-wang

Kim Mi-Kyung

Kwon Jeong-kwon

Lee Jae-wook

Teacher

Lee Jae-wook

Resident 1

Kim Kang-hyeon

Manager (webtoon editor)

Sol-bin Ahn

Solbin

Kim Sook

Kim Sook (Cho Seok's old friend)

Seul-gi Park

Self

Jang Young Yoo

PD

Tae-sun Hong

Wedding host

Ye-in

Female student

Hyun-Jong Yoo

Cho Seok's friend

Yun-mi Shin

Ae-bong's friend

Sung-ho Kim

Muscled body

Jin-woo Yang

Skinny body