Big Mouth

Composer

• 
  Park Se Jun

Director

• 
  Oh Choong Hwan
• 
  Bae Hyun Jin

Screenwriter

• 
  Jung Kyung Soon
• 
  Jang Young Chul

Main Role

• 
  Lee Jong Suk

  Park Chang Ho

  Main Role
• 
  Lim Yoon A

  Ko Mi Ho

  Main Role
• 
  Kim Joo Heon

  Choi Do Ha

  Main Role

Support Role

• 
  Kwak Dong Yeon

  Jerry

  Support Role
• 
  Yang Kyung Won

  Kong Ji Hun

  Support Role
• 
  Ok Ja Yeon

  Hyun Ju Hui

  Support Role
• 
  Oh Eui Shik

  Kim Sun Tae

  Support Role
• 
  Kim Jung Hyun

  Jung Chae Bong

  Support Role
• 
  Lee Yoo Joon

  Han Jae Ho

  Support Role
• 
  Oh Ryoong

  Lee Du Geun

  Support Role
• 
  Yoon Seok Hyun

  Cha Seung Tae

  Support Role
• 
  Park Hoon

  Seo Jae Yong

  Support Role
• 
  Kim Gyu Seon

  Ashley Kim

  Support Role
• 
  Jang Hyuk Jin

  Choi Jong Rak

  Support Role
• 
  Kim Seon Hwa

  Park Mi Yeong

  Support Role
• 
  Park Se Hyun

  Jang Hui Ju

  Support Role
• 
  Jung Jae Sung

  Park Yun Gab

  Support Role
• 
  Yang Hyung Wook

  No Bak

  Support Role
• 
  Lee Gi Young

  Ko Gi Gwang

  Support Role
• 
  Kim Dong Won

  Kan Su Cheol

  Support Role
• 
  Hong Ji Hee

  Jang Hye Jin

  Support Role
• 
  Song Kyung Chul

  Yang Chun Sik

  Support Role
• 
  Yoo Tae Joo

  Tak Gwang Yeon

  Support Role
• 
  Jeon Gook Hwan

  Kang Seong Geun [Chairman]

  Support Role
• 
  Lee Seung Hyung

  [Chairman Kang's secretary]

  Support Role
• 
  Han Dong Ho

  Secretary Jo

  Support Role
• 
  Kim Jung Yeon

  Kim Gyeong Seok

  Support Role
• 
  Lee Chang Jik

  Cho Hae Su [Do Ha's grandfather]

  Support Role
• 
  Lee Seo An

  [Seung Tae's wife]

  Support Role

Guest Role

• 
  Park Sang Hyun

  Kim Su Yeon [Nurse] (Ep. 1)

  Guest Role
• 
  Park Yong

  [Judge] (Ep. 1)

  Guest Role
• 
  Shin Seung Yong

  [Angry client] (Ep. 1)

  Guest Role
• 
  Lee Byeong Cheol

  [Angry client] (Ep. 1)

  Guest Role
• 
  Kim Ki Ryung

  [Angry client] (Ep. 1)

  Guest Role
• 
  Seo Myung Chan

  [Ji Hun's butler] (Ep. 1)

  Guest Role
• 
  Lee Dong Gyu

  [Radio program host] (Ep. 1)

  Guest Role
• 
  Yoon Kwan Woo

  [Gucheon court staff] (Ep. 1)

  Guest Role
• 
  Kim Oh Bok

  [Defendant's attorney] (Ep. 1)

  Guest Role
• 
  Lee Sang Kyung

  [Waitress] (Ep. 1, 10)

  Guest Role
• 
  Song Ha Rim

  [Prisoner 7941] (Ep. 2)

  Guest Role
• 
  Hong Joo Hyung

  [Prisoner 4302] (Ep. 2)

  Guest Role
• 
  Jang In Ho

  [Detective] (Ep. 2)

  Guest Role
• 
  Jung Hyun Woo

  [TV reporter] (Ep. 2)

  Guest Role
• 
  Min Sang Woo

  [Prison guard] (Ep. 2)

  Guest Role
• 
  Jin Yong Wook

  [Prisoner 2718] (Ep. 2)

  Guest Role
• 
  Lee Joon Gyu

  [Prisoner 8324] (Ep. 2)

  Guest Role
• 
  Yoo Soo Bin

  [Upstairs neighbor] (Ep. 2)

  Guest Role
• 
  Kim Do Wan

  [Upstairs neighbor] (Ep. 2)

  Guest Role
• 
  Seon Yul U

  [Prisoner #2007] (Ep. 2, 4-5, 7)

  Guest Role
• 
  Kim Shi Young

  [Doctor] (Ep. 3)

  Guest Role
• 
  Heo Woong

  [Prisoner 1002] (Ep. 3-4)

  Guest Role
• 
  Park Jung Bok

  [Prisoner 5362] (Ep. 3-4)

  Guest Role
• 
  Jin Mo

  [Prisoner 6678] (Ep. 3-4)

  Guest Role
• 
  Ma Jung Pil

  [Doctor] (Ep. 4)

  Guest Role
• 
  Kim Bum Suk

  [Detective] (Ep. 4)

  Guest Role
• 
  Kim Won Seok

  [Detective] (Ep. 4)

  Guest Role
• 
  Sin Dong Eun

  [Prison doctor] (Ep. 4)

  Guest Role
• 
  Kim Mi Ra

  [Patient's guardian] (Ep. 4)

  Guest Role
• 
  Lee Young Jin

  Choi Man Ho (Ep. 4, 14)

  Guest Role
• 
  Han Ki Joong

  Kim Gap Ju [Secretary general] (Ep. 4, 14)

  Guest Role
• 
  Shin Deok Ho

  Security Guard Ham (Ep. 5)

  Guest Role
• 
  Hong Suk Bin

  [Fishing reservoir man] (Ep. 5)

  Guest Role
• 
  Shin Seung Hwan

  Peter Hong (Ep. 5, 10-21)

  Guest Role
• 
  Kim Joong Don

  Hwang Ji Hyeok [Guard] (Ep. 7)

  Guest Role
• 
  Lee Yoon Sang

  Kong Ji Hun [Child, photo] (Ep. 7)

  Guest Role
• 
  Pyo Young Seo

  [Jerry's sister] (Ep. 7)

  Guest Role
• 
  Park Hee Eun

  [Gi Seong's wife] (Ep. 7)

  Guest Role
• 
  Goo Shi Yeon

  [Gi Seong's relative] (Ep. 7)

  Guest Role
• 
  Lee Seung Jun

  [Gi Seong's relative] (Ep. 7)

  Guest Role
• 
  Yoon Hwan

  [Du Geun's assistant] (Ep. 7)

  Guest Role
• 
  Kim Si Kook

  [Chae Bong's assistant] (Ep. 7)

  Guest Role
• 
  Park Gwang Jae

  [Jiseong Mental Center staff] (Ep. 7-8)

  Guest Role
• 
  Kim Do Young

  Hong Gwang Ho [Doctor] (Ep. 7, 9)

  Guest Role
• 
  Shin Na Ra

  [Police officer] (Ep. 8)

  Guest Role
• 
  Kim Min

  [Police station student] (Ep. 8)

  Guest Role
• 
  Bae Ho Geun

  Producer Na (Ep. 8-9)

  Guest Role
• 
  Jang Joon Ho

  [Judge] (Ep. 8-9)

  Guest Role
• 
  Park Ji Ho

  Sung Bo Gyeong [Reporter] (Ep. 9)

  Guest Role
• 
  Kim Kwon

  [Reporter] (Ep. 9)

  Guest Role
• 
  Lee Jae U

  [Reporter] (Ep. 9)

  Guest Role
• 
  Cho Yu Jin

  [Reporter] (Ep. 9)

  Guest Role
• 
  Lee Taek Geun

  [Ji Hun's secretary] (Ep. 9)

  Guest Role
• 
  Lee Jang Ho

  Bae Tae Yeong [Guard] (Ep. 10)

  Guest Role
• 
  Han Sa Myung

  [Prisoner #1708] (Ep. 10)

  Guest Role
• 
  Ki Eun Yoo

  Choi Do Ha [Young] (Ep. 10, 12)

  Guest Role
• 
  Park No Kyeong

  [Prisoner] (Ep. 11)

  Guest Role
• 
  Lee Kun Goo

  [Prisoner] (Ep. 11)

  Guest Role
• 
  Oh Ki Hwan

  [Detective] (Ep. 11)

  Guest Role
• 
  Mi Seok

  [Prisoner 2093] (Ep. 11)

  Guest Role
• 
  Choi Yoon Bin

  [Prisoner 6205] (Ep. 11)

  Guest Role
• 
  Jun Sung Won

  [Prisoner 3857] (Ep. 11)

  Guest Role
• 
  Cha Shi Won

  Han Yeon Seong [Guard] (Ep. 11-12)

  Guest Role
• 
  Jeon Jae Hong

  [Prison guard] (Ep. 11-12)

  Guest Role
• 
  Lee Gyu Sub

  [Prisoner 5161] (Ep. 11-12)

  Guest Role
• 
  Lee Yoon Sang

  [Judge] (Ep. 12)

  Guest Role
• 
  Kwon Ban Suk

  [Reporter] (Ep. 12)

  Guest Role
• 
  Lee Hyun Kul

  [Riot officer] (Ep. 12)

  Guest Role
• 
  Moon Sung Bok

  [Prisoner 4849] (Ep. 12)

  Guest Role
• 
  Baek Seung Ik

  "Waterfowl" (Ep. 13)

  Guest Role
• 
  Park Hyo Bin

  [Reporter] (Ep. 13)

  Guest Role
• 
  Im Jae Geun

  [Reporter] (Ep. 13)

  Guest Role
• 
  Lim Seung Beom

  [Reporter] (Ep. 13)

  Guest Role
• 
  Park Sang Hwi

  [Reporter] (Ep. 13)

  Guest Role
• 
  Kim Sa Hun

  [Reporter] (Ep. 13)

  Guest Role
• 
  Jin Tae Yeon

  [Club hostess] (Ep. 13)

  Guest Role
• 
  Woo Hyun Seo

  [Club hostess] (Ep. 13)

  Guest Role
• 
  Im Yong Soon

  [Charles Hotel owner] (Ep. 13)

  Guest Role
• 
  Jung Hyung Suk

  [Man in attendance] (Ep. 13)

  Guest Role
• 
  Oh Min Jung

  [Nursing home nurse] (Ep. 13)

  Guest Role
• 
  Jung Jae Jin

  Mr. Choi (Ep. 13-14)

  Guest Role
• 
  Jang Eui Don

  Han Seok Ho [Police officer] (Ep. 13, 16)

  Guest Role
• 
  Sung Nak Kyung

  [Yun Gab's subordinate] (Ep. 14)

  Guest Role
• 
  Lee Do Hye

  [Gwang Yeon's sister] (Ep. 14-15)

  Guest Role
• 
  Lee Hyoung Hun

  [Gwang Yeon's brother] (Ep. 14-15)

  Guest Role
• 
  Park Sang Jong

  Attorney Jung (Ep. 15)

  Guest Role
• 
  Jung Dong Geun

  Jeon Su Il [Prosecutor] (Ep. 15)

  Guest Role
• 
  Shim Young Min

  No Jung Seong [Doctor] (Ep. 15)

  Guest Role
• 
  Kim Do Hyung

  Kim Gi Su [Attorney] (Ep. 15)

  Guest Role
• 
  Han Dong Gyu

  Mr. Ko (Ep. 15-16)

  Guest Role
• 
  Hwang In Jun

  Min Byeong Nam (Ep. 15-16)

  Guest Role
• 
  Kim Geon Ho

  [TV debate staff] (Ep. 15-16)

  Guest Role
• 
  Kim Gyeong Min

  [TV debate moderator] (Ep. 15-16)

  Guest Role
• 
  Park Young Bok

  Mr. Yeom (Ep. 16)

  Guest Role
• 
  Yoon Bok Sung

  Lee Chang Seob (Ep. 16)

  Guest Role
• 
  Min Eung Shik

  [Judge] (Ep. 16)

  Guest Role
• 
  Bae Cheol Keun

  [Prisoner]

  Guest Role
• 
  Lee Jung Hoon

  [Prisoner 8450]

  Guest Role
• 
  Lee Ho Won

  [Prisoner 5710]

  Guest Role