The Sound of Your Heart

Lee Kwang-soo

Jo-Suk· 20 ep

Kim Dae-myung

Jo-Joon· 20 ep

Jung So-min

Choi Ae-Bong· 20 ep

Kim Byeong-ok

Jo Chul-Wang· 20 ep

Kim Mi-kyeong

Kwon Jung-Gwon· 20 ep

Kim Kang-hyun

Webtoon editor· 3 ep

Seo Hyun-chul

Deputy Department Head Seo· 3 ep

Choi Dae-sung

Taxi driver· 3 ep

Yum Dong-hun

Department Head Uhm· 2 ep

Kim Min-gue

Soldier· 2 ep

Ok Joo-ri

Kim Sun-Kwon· 2 ep

Seo Woo-jin

Interviewer· 2 ep

Yoon Jin-yi

Jo Suk's old friend· 2 ep

Lee Su-ji

Voice phishing woman· 2 ep

Park Kyung-hye

Ae Bong's friend· 2 ep

Kim Min-ho

Jo Suk's friend· 2 ep

Song Joong-ki

Webtoon writer / Jo Suk's friend· 1 ep

Kim Se-jeong

Woman next door in Room 205· 1 ep

Jang Hyo-jin

Director· 1 ep

Lee Jae-eun

Lee Ji-Soon· 1 ep

Ban Hye-ra

Middle-aged wife· 1 ep

Joo Boo-jin

Grandma Kim Jeom-Rye / Deok Hwan's mother· 1 ep

Seo Jin-won

policeman· 1 ep

Kang Kyun-sung

Jang Nam-Chul | Kyun Sung· 1 ep

Jung Yi-rang

Kim Yoon-ji· 1 ep

Kim Sook

Kim Sook· 1 ep

Park Na-rae

Jo Suk's old friend· 1 ep

Seo Jung-joon

Jo Suk's classmate· 1 ep

Geum Gwang-san

Jo Chul Wang's subordinate· 1 ep

Kim Roi-ha

Mex / Kim Nam-Chul· 1 ep

Kim Min-kyoung

Club woman picked by Jo Joon· 1 ep

Lee Se-young

Jo Joon's lover· 1 ep

Son Young-soon

Grandma selling gum· 1 ep

Jung Joon-young

man next door in room 205· 1 ep

Kim Tae-won

Self· 1 ep

Shin Dong-yup

Self· 1 ep

Jeon Hyun-moo

Self· 1 ep

Park Seul-gi

Self· 1 ep

Jung So-yeon

Self· 1 ep

Bae Jin-yea

Self· 1 ep

Ahn Sol-bin

Self· 1 ep

Kim Yul-hee

Self· 1 ep

Woo Hyeon

Ae Bong's father· 1 ep

Lee Yong-nyeo

Landlord granma / Ae Bong's neighbor· 1 ep

Yoo Jang-young

television producer· 1 ep

Cao Lu

Chinese actress· 1 ep

Kim Jong-kook

Jo Jong-Wook | Jo Jong-Kook· 1 ep

Gong Seung-yeon

Ye Rim· 1 ep

Shin Gu

Judge· 1 ep

Moon Ji-yoon

Jo Suk's colleague· 1 ep