Hwayi: A Monster Boy

Kim Yoon-seok

Seok-tae

Yeo Jin-goo

Hwa-yi

Cho Jin-woong

Ki-tae

Jang Hyun-sung

Jin-seong

Kim Sung-kyun

Dong-beom

Park Hae-joon

Beom-soo

Im Ji-eun

Young-joo

Park Yong-woo

Det. Chang-ho

Kim Young-min

Jung-min

Seo Young-hwa

Seon-ja

Yoo Yeon-seok

Park Ji-won

Nam Ji-hyun

Yoo-kyung

Lee Kyung-young

Lim Hyeong-taek

Moon Sung-keun

CEO Jeon

Han Joo-wan

CEO Jeon's Attendant

Lee You-mi

Yoo-kyung's Friend 1

Park Gyu-ri

Yoo-kyung's Friend 2

Park Jin-woo

Detective Jang

Park Myung-shin

Assemblywoman Jeong

Han Chul-woo

Detective Kim

Min Young

Paju Hospital Nurse

Min Bok-gi

Ex-prosecutor

Kim Lok-kyoung

Security Guard

Park Kyung-hye

Union Staff

Son Jong-hak

Police Chief

Park Sung-jun

Student

Woo Jung-kook

Blind Masseur

Son Kang-gook

Police Officer

Im So-mi

Cherry Tavern Young Lady

Lee Jun-hyeok

Police Officer

Yu Hyun-zun

Detective

Im Hyeong-taek

Detective

Jang Seong-beom

Young Seok-tae

Seol Woo-sin

Incheon Factory Backing Gang Member

Ji Eun-il

Private Security

Cho Seong-hui

Truck Driver in Front of the School