Big Mouth

Lee Jong-Suk

Park Chang-ho

Im Yoon-ah

Ko Mi-ho

Kim Joo-hun

Choi Do-ha

Yang Kyung-won

Gong Ji-hoon

Ja-Yeon Ok

Hyun Ju-hee

Lee Ki-young

Ko Gi-kwang (Mi-ho's Father)

Lee Yoo-Joon

Dr. Han Jae-ho

Kim Jung-hyun

Jeong Chae-bong

Oh Ryoong

Lee Doo-geun

Oh Eui-Sik

Kim Soon-tae

Dong-won Kim

Gan Soo-cheol

Victoria Grace

Ashley

Victoria Grace

Huiju

Victoria Grace

Additional Voices

Ren Hanami

Miyeong

Christian Banas

Jerry

Jae-Sung Jung

Park Yoon-gab

Kyeong-cheol Song

Chun-sik Yang

Kyeong-cheol Song

Gang Leader at Prison

Kwak Dong-yeon

Jerry Oh Jin-cheol

Feodor Chin

Park Yoon-gab

Feodor Chin

Prison Warden