The Sound of Your Heart (2016)

Director

• 
  Ha Byung Hoon

Executive Producer

• 
  Hyun Woo Thomas Kim

Original Creator

• 
  Cho Seok

Screenwriter

• 
  Kwon Hye Joo
• 
  Kim Yeon Ji

Main Role

• 
  Lee Kwang Soo

  Jo Suk

  Main Role
• 
  Kim Dae Myung

  Jo Joon

  Main Role
• 
  Jung So Min

  Choi Ae Bong

  Main Role
• 
  Kim Byung Ok

  Jo Chul Wang

  Main Role
• 
  Kim Mi Kyung

  Kwon Jung Gwon

  Main Role

Support Role

• 
  Park Sang Hoon

  Jo Joon [Young]

  Support Role
• 
  Jang Ho Joon

  Jo Suk [Young]

  Support Role

Guest Role

• 
  Kim Kang Hyun

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

  Guest Role
• 
  Song Joong Ki

  [Webtoon writer / Jo Suk's friend] (Ep. 1)

  Guest Role
• 
  Seo Hyun Chul

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

  Guest Role
• 
  Yeom Dong Hun

  Department Head Uhm (Ep.1, 19)

  Guest Role
• 
  Jang Hyo Jin

  [Director] (Ep. 2)

  Guest Role
• 
  Lee Jae Eun

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

  Guest Role
• 
  Ban Hye Ra

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

  Guest Role
• 
  Choi Dae Sung

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

  Guest Role
• 
  Joo Boo Jin

  Grandma Kim Jeom Rye / Deok Hwan's mother] (Ep.2)

  Guest Role
• 
  Kim Min Gue

  [Soldier] (Ep. 2) / [Male college student] (Ep. 14)

  Guest Role
• 
  Seo Jin Won

  [policeman] (Ep.2)

  Guest Role
• 
  Ok Joo Ri

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

  Guest Role
• 
  Seo Woo Jin

  [Interviewer] (Ep. 4,20)

  Guest Role
• 
  Kang Kyun Sung

  Jang Nam Chul | Kyun Sung [Jo Suk's old friend] (Ep. 4)

  Guest Role
• 
  Jung Yi Rang

  Kim Yoon ji [Jo Suk's old friend] (Ep.4)

  Guest Role
• 
  Kim Sook

  Kim Sook [Jo Suk's old friend] (Ep.4)

  Guest Role
• 
  Park Na Rae

  [Jo Suk's old friend] (Ep.4)

  Guest Role
• 
  Seo Jung Joon

  [Jo Suk's classmate] (Ep.4)

  Guest Role
• 
  Yoon Jin Yi

  [Jo Suk's old friend] (Ep. 2,4)

  Guest Role
• 
  Geum Kwang San

  [Jo Chul Wang's subordinate] (Ep. 5)

  Guest Role
• 
  Kim Roe Ha

  Mex / Kim Nam Chul [Mex Chicken's President] (Ep.5)

  Guest Role
• 
  Lee Soo Ji

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

  Guest Role
• 
  Kim Min Kyung

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

  Guest Role
• 
  Lee Se Young

  [Jo Joon's lover] (Ep.8)

  Guest Role
• 
  Park Kyung Hye

  [Ae Bong's friend] (Ep.9-10)

  Guest Role
• 
  Hong Seo Joon

  [Priest]

  Guest Role
• 
  Kim Min Ho

  [Jo Suk's friend] (Ep.10,15)

  Guest Role
• 
  Son Young Sun

  [Grandma selling gum] (Ep.10)

  Guest Role
• 
  Jung Joon Young

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

  Guest Role
• 
  Kim Se Jeong

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

  Guest Role
• 
  Kim Tae Won

  Himself (Ep.12)

  Guest Role
• 
  Shin Dong Yup

  Himself (Ep.12)

  Guest Role
• 
  Jun Hyun Moo

  [Himself] (Ep. 12)

  Guest Role
• 
  Park Seul Ki

  Herself (Ep. 12)

  Guest Role
• 
  Jung So Yeon

  Herself (Ep.12)

  Guest Role
• 
  ZN

  Herself (Ep.12)

  Guest Role
• 
  Ahn Sol Bin

  Herself (Ep. 12)

  Guest Role
• 
  Kim Yool Hee

  Herself (Ep.12)

  Guest Role
• 
  Woo Hyun

  [Ae Bong's father] (Ep. 13)

  Guest Role
• 
  Lee Yong Nyeo

  [Landlord granma / Ae Bong's neighbor] (Ep. 13)

  Guest Role
• 
  Yoo Jang Young

  [television producer] (Ep.15)

  Guest Role
• 
  Cao Lu

  [Chinese actress] (Ep. 16)

  Guest Role
• 
  Kim Jong Kook

  Jo Jong Wook | Jo Jong Kook [Jo Suk's twin cousins] (Ep.17)

  Guest Role
• 
  Gong Seung Yeon

  Ye Rim [Blind date] (Ep. 17)

  Guest Role
• 
  Shin Goo

  [Judge] (Ep. 19)

  Guest Role
• 
  Moon Ji Yoon

  [Jo Suk's colleague] (Ep.20)

  Guest Role
• 
  Lee Jae Wook

  [Teacher]

  Guest Role
• 
  In Sung Ho

  [Association staff]

  Guest Role
• 
  Lee Moo Nyoung

  [Department head]

  Guest Role
• 
  Shin Hee Chul Guest Role
• 
  Choi Yoon Bin

  [Middle-age man]

  Guest Role
• 
  Hwang Bo Jeong Il

  [Guard]

  Guest Role
• 
  Nam Sang Ran

  [Passerby]

  Guest Role
• 
  Kim Yoo Jung

  Herself (Ep. 12)

  Guest Role
• 
  Choi Yang Rak

  [Photographer]

  Guest Role
• 
  Jo Ryeon

  [Ae Bong's mother]

  Guest Role

Unknown

• 
  Yang Jin Woo Unknown
• 
  Lee Seung Yeon Unknown
• 
  Han Yeo Wool Unknown
• 
  Shin Yeon Mi Unknown