Big Mouth (South Korean TV series)

Big Mouth (Korean: 빅마우스) is a 2022 South Korean television series starring Lee Jong-suk, Im Yoon-ah, and Kim Joo-hun. It aired on MBC TV from July 29 to September 17, 2022, every Friday and Saturday at 21:50 (KST).^[10][11] It is also available for streaming on Disney+ in selected regions.^[12]

Big Mouth
Promotional poster
Also known as	Big Mouse[a][2]
Hangul	빅마우스
Revised Romanization	Bigma-useu
Genre	Hardboiled[3] Noir[3] Legal[4] Crime[5]
Created by	Jang Young-chul[1] Jung Kyung-soon[1]
Developed by	Kim Ho-jun (planning)[6]
Written by	Kim Ha-ram[7]
Directed by	Oh Chung-hwan[6] Bae Hyun-jin[6]
Starring	Lee Jong-suk Im Yoon-ah Kim Joo-hun
Music by	Park Se-joon[8]
Country of origin	South Korea
Original language	Korean
No. of episodes	16
Production
Executive producer	Ahn In-yong[6]
Producers	Lee Sang-baek[6] Kim Young-gyu[6]
Production companies	AStory[7] Studio Dragon[7] A-Man Project[7]
Budget	₩30 billion[9]
Original release
Network	MBC TV
Release	July 29 (2022-07-29) – September 17, 2022 (2022-09-17)

Synopsis

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]

Cast

Main

• 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 but succumbs to cancer.^[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]

Supporting

NR Forum

• 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

• 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-hyun as Jang Hee-joo

A nurse at Gucheon Hospital.^[18]

Gucheon Prison

• 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

• Lee Ki-young as Ko Gi-kwang

Mi-ho's father.^[26]

• Oh Eui-shik as Kim Soon-tae

A lawyer who is Chang-ho's best friend and assistant.^[27]

Extended

• 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

• Yoo Su-bin as Chang-ho and Mi-ho's neighbor.^[35]
• Kim Do-wan as Chang-ho and Mi-ho's neighbor.^[35]

Production and release

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

Part 1

Released on August 6, 2022 (2022-08-06)^[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		2:51
Total length:					5:42

Viewership

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

Big Mouth : South Korea viewers per episode (millions)

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.

Awards and nominations

Award ceremony	Year	Category	Nominee(s) / Work	Result	Ref.
MBC Drama Awards	2022	Grand Prize (Daesang)	Lee Jong-suk	Won	[40]
		Drama of the Year	Big Mouth	Won
		Top Excellence Award, Actor in a Miniseries	Lee Jong-suk	Nominated
		Top Excellence Award, Actress in a Miniseries	Im Yoon-ah	Won
		Best Couple Award	Lee Jong-suk and Im Yoon-ah	Won

Notes

1. "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.