Pemeran The Sound of Your Heart

Lee Kwang Soo

as Jo Suk

Pemeran Utama

Kim Dae Myung (김대명)

as Jo Joon

Pemeran Utama

Jung So Min (정소민)

as Choi Ae Bong

Pemeran Utama

Kim Byung Ok

as Jo Chul Wang

Pemeran Utama

Kim Mi Kyung

as Kwon Jung Gwon

Pemeran Utama

Park Soo Oh

as Cho Jun [Young]

Pemeran Pembantu

Jang Ho Joon

as Jo Suk [Young]

Pemeran Pembantu

Kim Kang Hyun

as [Webtoon editor] (Ep. 1, 7, 20)

Bintang Tamu

Seo Hyun Chul

as Deputy Department Head Seo (Ep. 1, 16, 19)

Bintang Tamu

Yeom Dong Hun

as Department Head Um (Ep. 1, 19)

Bintang Tamu

Jang Hyo Jin

as [Director] (Ep. 2)

Bintang Tamu

Lee Jae Eun

as Lee Ji Sun [Room 412 resident] (Ep. 2)

Bintang Tamu

Ban Hye Ra

as [Middle-aged wife #1] (Ep. 2)

Bintang Tamu

Seo Jin Won

as [Police officer] (Ep. 2)

Bintang Tamu

Ok Joo Ri

as Kim Seon Gwon [Neighbourhood resident] (Ep. 2, 7)

Bintang Tamu

Choi Dae Sung

as [Taxi driver] (Ep. 2, 8, 10)

Bintang Tamu

Kim Min Gue (김민규)

as [Soldier] (Ep. 2) | [College student] (Ep. 14)

Bintang Tamu

Seo Woo Jin

as [Interviewer] (Ep. 4, 20)

Bintang Tamu

Kim Min Kyung

as [Club woman picked by Jo Joon] (Ep. 7)

Bintang Tamu

Son Young Soon

as [Grandma selling gum] (Ep. 10)

Bintang Tamu

Jung Joon Young

as [Man next door / room 205] (Ep. 12)

Bintang Tamu

Kim Se Jeong (김세정)

as [Woman next door in Room 205] (Ep. 12)

Bintang Tamu

Kim Tae Won

as [Himself] (Ep. 12)

Bintang Tamu

Shin Dong Yeob

as [Himself] (Ep. 12)

Bintang Tamu

Jun Hyun Moo

as [Himself] (Ep. 12)

Bintang Tamu

Park Seul Ki

as [Herself] (Ep. 12)

Bintang Tamu

Lena Park

as [Herself] (Ep. 12)

Bintang Tamu

Jung So Yeon

as [Herself] (Ep. 12)

Bintang Tamu

Jin Yea

as [Herself] (Ep. 12)

Bintang Tamu

Ahn Sol Bin

as [Herself] (Ep. 12)

Bintang Tamu

Kim Yool Hee

as [Herself] (Ep. 12)

Bintang Tamu

Kim Yoo Jung

as [Herself] (Ep. 12)

Bintang Tamu

Yoo Jang Young

as [Television producer] (Ep. 15)

Bintang Tamu

Lee Su Ji

as [Voice phishing woman] (Ep. 6) | [Interpreter] (Ep. 16)

Bintang Tamu

Cao Lu

as [Chinese actress] (Ep. 16)

Bintang Tamu

Gong Seung Yeon (공승연)

as Ye Rim [Blind date] (Ep. 17)

Bintang Tamu

Shin Goo

as [Judge] (Ep. 19)

Bintang Tamu

Hong Seo Joon

as [Priest]

Bintang Tamu

Lee Jae Wook

as [Teacher]

Bintang Tamu

In Sung Ho

as [Association staff]

Bintang Tamu

Nam Sang Ran

as [Passerby]

Bintang Tamu

Lee Moo Nyoung

as [Department head]

Bintang Tamu

Choi Yang Rak

as [Photographer]

Bintang Tamu

Choi Yoon Bin

as [Middle-age man]

Bintang Tamu

Hwang Bo Jeong Il

as [Guard]

Bintang Tamu

Shin Hee Chul

Bintang Tamu

Ha Byung Hoon

Sutradara

Hyun Woo Thomas Kim

Executive Producer

Cho Seok

Original Creator

Kwon Hye Joo

Screenwriter

Kim Yeon Ji

Screenwriter