Plot: Gong Jihoon makes a bet with Changho to find out his true identity.
Cast
Lee Jong-sukPark ChanghoLee Jong-suk was 32 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Thu, Sep 14 1989
YoonaGo MihoYoona was 32 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, May 30 1990
Kim Ju-hunChoi DohaKim Ju-hun was 42 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Sat, Mar 01 1980
Kwak Dong-yeonJerryKwak Dong-yeon was 25 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Mar 19 1997
Yang Kyung-wonGong JihoonYang Kyung-won was 41 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Apr 01 1981
Ok Ja-yeonHyeon JooheeOk Ja-yeon was 33 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Dec 19 1988
Oh Eui-sikKim SoontaeOh Eui-sik was 38 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Nov 01 1983
Kim Jeong-hyeonJung ChaebongKim Jeong-hyeon was 46 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Jun 28 1976
Lee Yoo-junHan JaehoLee Yoo-jun was 39 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Nov 24 1982
Oh RyoongLee DoogeunOh Ryoong was 42 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Thu, Jul 31 1980
Yoon Seok-hyunCha SeungtaeYoon Seok-hyun was 38 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Sun, Sep 04 1983
Park HoonSeo JaeyoungPark Hoon was 41 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Apr 27 1981
Kim Kyu-seonAshley KimKim Kyu-seon was 34 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Jul 26 1988
Jang Hyuk-jinChoi JungrakJang Hyuk-jin was 50 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Aug 16 1971
Kim Sun-hoaPark MiyoungKim Sun-hoa was 51 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, May 24 1971
Park Se-hyunJang HeejooPark Se-hyun was 23 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Sep 07 1998
Jeong Jae-seongPark YoongabJeong Jae-seong was 51 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Dec 16 1970
Kang Hyung-wookNo BakKang Hyung-wook was 37 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, May 27 1985
Lee Ki-youngGo GikwangLee Ki-young was 58 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Aug 26 1963
Kim Dong-wonGan SoocheolKim Dong-won was 38 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Jun 26 1984
Hong Ji-heeJang HyejinHong Ji-hee was 34 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Jul 27 1988
Song Gyeong-cheolYang ChoonsikSong Gyeong-cheol was 69 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Nov 05 1952
Yoo Tae-jooTak GwangyeonYoo Tae-joo was 27 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Sun, Jan 08 1995
Jeon Kuk-hwanChairman Kang SeonggeunJeon Kuk-hwan was 70 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Jul 21 1952
Lee Seung-HyungChairman Kang's secretaryLee Seung-Hyung was 54 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Sat, Feb 17 1968
Han Dong-hoSecretary JoHan Dong-ho was 32 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Jan 30 1990
Jung YeonKim GyeongsookJung Yeon was >> in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Unknown Birthday
Lee Chang-jikChoi HaesooLee Chang-jik was 60 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Sun, Dec 17 1961
Lee Seo-AnCha Seungtae's wifeLee Seo-An was 33 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Mar 03 1989
Kim Kyu-naKim Kyu-na was 8 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Fri, Aug 23 2013
Park Jeong-bokprisoner 5362Park Jeong-bok was 38 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Thu, Dec 08 1983
Heo Woong[Prisoner 1002]Heo Woong was 41 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Thu, Dec 04 1980
Jin Mo[Prisoner 6678]Jin Mo was 42 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Tue, Apr 15 1980
Lee Young-jinChoi Man HoLee Young-jin was >> in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Unknown Birthday
Han Gi-joongKim Gap Joo [Secretary general]Han Gi-joong was 61 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Mon, Mar 13 1961
Ma Jeong-pil[Doctor]Ma Jeong-pil was 46 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Sun, Jul 18 1976
Kim Bum-suk[Detective]Kim Bum-suk was 43 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Jul 25 1979
Kim Won-suk[Detective]Kim Won-suk was >> in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Unknown Birthday
Shin Dong-eun[Prison doctor]Shin Dong-eun was 46 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Wed, Jun 09 1976
Kim Mi-ra[Patient's guardian]Kim Mi-ra was 43 in Big Mouth - Season 1 - Episode 4 (Episode 4).
Birthday: Thu, Jun 21 1979