Weak Hero

Park Ji-hoon

Yeon Si-eun (16 episodes)

Choi Hyun Wook

Ahn Su-ho (16 episodes)

Hong Kyung

Oh Bum-seok (8 episodes), Oh Beom-seok (8 episodes)

Yoo Su-bin

Choi Hyo-man (9 episodes)

Lee Yeon

Young-yi (8 episodes)

Kim Su Gyeom

Jeon Young-bin (8 episodes)

Shin Seung-Ho

Jeon Seok-dae (8 episodes)

Cha Woo Min

Kang Woo-young (8 episodes)

Yoon Jung-hoon

Lee Jeong-chan (8 episodes)

Hwang Sung-bin

Han Tae-hoon (8 episodes)

나철

Kim Gil-soo (8 episodes)

Ryeoun

Park Hu-min (8 episodes)

Choi Min-yeong

Seo Jun-tae (8 episodes)

Bae Na-ra

Na Baek-jin (8 episodes)

Lee Min-jae

Go Hyun-tak (8 episodes)

Jun

Geum Seong-je (8 episodes)

Lee Myeong-ro

Baek Dong-ha (6 episodes)

Yoon Jong-bin

Do Seong-mok (6 episodes)

전배수

Baku's Father (6 episodes)

Gong Hyun-joo

Si-eun's Mother (5 episodes)

Jo Jeong-Seok

Choi Chang-hee (4 episodes)

Lim Ho-jun

2-4 Homeroom Teacher (3 episodes)

Son Bo-Seung

Seoknam's Gorilla (3 episodes)

Jang Dae-Woong

Kim Won-seok (2 episodes)

Jung Hyeon-jun

Child Park Hu-min (2 episodes)

Byun Joong-hee

An Su-ho's Grandmother (1 episode)

Kim Hyeon

School Principal (1 episode)

Lee Hae-woon

Homeroom Teacher (1 episode)

Jeon Su-Ji

Psychiatrist (1 episode)

Jang Jun-whee

2-7 Homeroom Teacher (1 episode)

Jo Ah Young

Yeong-bin's Friend (1 episode)

Lee Hyun-bae

Yeong-bin's Friend (1 episode)

Yu Seong-yong

Baseball Player (1 episode)

Kang Hak-soo

Police Officer (1 episode)

Oh Su Yun

Yeong-bin's Mother (1 episode)

Kim Geon

Baek-jin's Classmate (1 episode)

Kim Hyeok-jong

Police Officer 1 (1 episode)

Kim Tae-joon

Police Officer 3 (1 episode)

Bae Hyun-Kyung

Detective (1 episode)

Pyeon Hae-jun

Kim Hui-jun (1 episode)

Park Sang-eun

Jeong-chan's Friend (1 episode)

Shin Mi-young

Orphanage Director (1 episode)

Jang Jae-ha

Child Yeon Si-eun (1 episode)

Han Jun-hee

Executive producer (8 episodes), Casting Director (8 episodes)

Kim Sung-ho

Unit production manager (8 episodes)

Louis Koo

Executive producer (8 episodes)

Peter Ho-Sun Chan

Executive producer (8 episodes)

Park Min-sun

Editor (8 episodes)

An Ji-hye

Production design (8 episodes)

류현

Storyboard Artist (8 episodes)

Park Dhan-hee

Director (16 episodes)

You Su-min

Director (16 episodes)

You Su-min

Writer (16 episodes)

류현

Storyboard (8 episodes)

Primary

Original music composer (16 episodes)

Jo Seung-yeon

Stunt Double (8 episodes)