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Big Mouth

Big Mouth (South Korean TV series).jpg

Promotional poster
Also known as Big Mouse[a][2]
Hangul 빅마우스
Created by
Developed by Kim Ho-jun (planning)[6]
Written by Kim Ha-ram[7]
Directed by
  • Oh Chung-hwan[6]
  • Bae Hyun-jin[6]
Music by Park Se-joon[8]
Country of origin South Korea
Original language Korean
No. of episodes 16
Executive producer Ahn In-yong[6]
  • Lee Sang-baek[6]
  • Kim Young-gyu[6]
Production companies
Budget ₩30 billion[9]
Original network MBC TV
Original release July 29 –
September 17, 2022

Big Mouth (Korean빅마우스RRBingmauseu) is a 2022 South Korean television series starring Lee Jong-sukIm Yoon-ah and Kim Joo-hun. It aired from July 29 to September 17, 2022 on MBC TV‘s Fridays and Saturdays at 21:50 (KST) time slot.[10][11] It is also available for streaming on Disney+ in selected regions.[12]


The series tells the story of an underperforming lawyer who gets caught up in a murder case. In order to survive and protect his family, he digs into a huge conspiracy among the privileged upper classes.[1][10][13]



  • Lee Jong-suk as Park Chang-ho: a third-rate lawyer with a ten percent success rate, called “Big Mouth” by his legal acquaintances due to his tendency to speak before acting. His life is suddenly in danger when he is mistaken for a genius conman known as “Big Mouse”.[a][14]
  • Im Yoon-ah as Ko Mi-ho: Chang-ho’s supportive wife who is a nurse and has a bold personality, as well as outstanding beauty.[1][15]
  • Kim Joo-hun as Choi Do-ha: the ambitious mayor of Gucheon, whose goal in life is to become the most dignified president.[16][17]


NR Forum[edit]

  • Yang Kyung-won as Gong Ji-hoon: the president of the media conglomerate Gukdong Daily and the chairman of the NR Forum.[16]
  • Kim Jung-hyun as Jung Chae-bong: the director of Chilbong Academy.[18]
  • Lee Yoo-joon as Han Jae-ho: a surgeon.[19]
  • Oh Ryung as Lee Du-geun: legal counsel of NR Forum.[18]
  • Yoon Seok-hyun as Cha Seung-tae: managing director of OC Group.[18]
  • Park Hoon as Seo Jae-yong: head of the Department of Internal Medicine, Hematology and Oncology at Gucheon University Hospital.[18]
  • Hong Ji-hee as Jang Hye-jin: Jae-ho’s wife who is a culinary researcher.[18][20]
  • Kim Kyu-seon as Ashley Kim: Ji-hoon’s wife, who is a Korean-American and the director of Woojung Gallery.[21]
  • Jang Hyuk-jin as Choi Jung-rak: a prosecutor at Gucheon Public Prosecutors’ Office.[18]

Gucheon Hospital[edit]

  • Ok Ja-yeon as Hyun Ju-hee: Do-ha’s wife who is the director of Gucheon Hospital.[16]
  • Kim Seon-hwa as Park Mi-young: the head nurse at Gucheon Hospital.[22]
  • Park Se-hyeon as Jang Hee-joo: a nurse at Gucheon Hospital.[18]

Gucheon Prison[edit]

  • Jeong Jae-sung as Park Yoon-gap: the prison warden of Gucheon Prison.[23]
  • Kim Dong-won as Gan Su-cheol: a prison officer at Gucheon Prison.[24]
  • Kwak Dong-yeon as Jerry / Oh Jin-chul (real name): a scammer with three previous convictions who respects the genius conman “Big Mouse”.[16][25]
  • Yang Hyung-wook as Noh Park: a prisoner at Gucheon Prison.[26]

People around Chang-ho[edit]


  • Yoo Tae-ju as Tak Kwang-yeon: a psychopath death row inmate at Gucheon Prison.[28][29]
  • Song Kyung-cheol as Yang Chun-sik: a gang leader.[30]
  • Park Jeong-bok as Go Tae-sik: a prisoner at Gucheon Prison.[31]
  • Shin Seung-hwan as Peter Hong[32]
  • Jeon Gook-hwan as Kang Seong-geun (Chairman Kang)[33][34]

Special appearances[edit]

Production and release[edit]

It was reported that filming was scheduled to start in the second half of 2021, with a budget of ₩30 billion.[9][17]

Big Mouth was initially confirmed to be released on tvN.[10] However, in April 2022, it was announced that the series would air on MBC TV‘s newly established Fridays and Saturdays time slot instead, in July.[36]

Original soundtrack[edit]

Part 1[edit]

Released on August 6, 2022[37]
No. Title Lyrics Music Artist Length
1. “Brand New” Justhis
  • Woo Ji-hun
  • Park Se-joon
Justhis 2:51
2. “Brand New” (Inst.)
  • Woo Ji-hun
  • Park Se-joon
Total length: 5:42


Big Mouth : South Korea viewers per episode (millions)

Season Episode number Average
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 1.124 1.129 1.431 1.685 1.732 1.951 1.977 1.888 2.008 1.771 2.054 2.228 1.534 1.960 2.145 2.527 1.822

Source: Audience measurement performed nationwide by Nielsen Korea.[38]

Average TV viewership ratings
Ep. Original broadcast date Average audience share
Nielsen Korea[38] TNmS[39]
Nationwide Seoul Nationwide
1 July 29, 2022 6.2% (7th) 6.3% (7th) 5.6% (10th)
2 July 30, 2022 6.1% (5th) 6.4% (4th) 6.1% (7th)
3 August 5, 2022 7.6% (4th) 8.1% (4th) 8.1% (5th)
4 August 6, 2022 8.6% (2nd) 8.7% (2nd) N/A
5 August 12, 2022 9.8% (4th) 10.0% (3rd) 9.6% (4th)
6 August 13, 2022 10.8% (2nd) 10.8% (2nd) 10.0% (2nd)
7 August 19, 2022 11.2% (3rd) 11.4% (3rd) 10.1% (4th)
8 August 20, 2022 10.4% (2nd) 10.3% (2nd) 9.6% (2nd)
9 August 26, 2022 11.5% (2nd) 11.7% (2nd) 11.0% (2nd)
10 August 27, 2022 10.0% (2nd) 10.2% (2nd) 9.4% (2nd)
11 September 2, 2022 11.4% (4th) 11.4% (3rd) 11.2% (4th)
12 September 3, 2022 12.0% (2nd) 12.0% (2nd) 11.4% (2nd)
13 September 9, 2022 8.3% (4th) 8.3% (4th) N/A
14 September 10, 2022 10.6% (2nd) 10.3% (2nd) 10.1% (2nd)
15 September 16, 2022 12.3% (3rd) 12.4% (3rd) 10.5% (3rd)
16 September 17, 2022 13.7% (2nd) 13.9% (2nd) 12.5% (2nd)
Average 10.0% 10.1% 9.7[b]
  • In the table above, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
  • N/A denotes ratings that were not released.


  1. Jump up to:a b “Big Mouth” and “Big Mouse” are both written as 빅마우스 in Korean.[1]
  2. ^ This average ratings is calculated based on the published ratings, the exact average ratings is unknown due to multiple ratings not published.

Big Mouth빅마우스



A lawyer, caught up in a murder case, becomes a notorious and genius con artist overnight, in order to fight against a huge conspiracy and survive.


Lee Jong-suk


Yang Kyung-won

Kim Ju-hun

Kwak Dong-yeon

Ok Ja-yeon

Lee Ki-young

Oh Eui-sik

Lee Yoon Sang



Oh Choong-hwan

No Image Available

Park Se-jun

No Image Available

Kim Ha-ram




Season 1

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