Yeon Si-eun (16 episodes)

Ahn Su-ho (16 episodes)

Oh Beom-seok (16 episodes)

Kang Woo-young (16 episodes)

Choi Hyo-man (9 episodes)

Park Hu-min (8 episodes)

Yeong-i (8 episodes)

Seo Jun-tae (8 episodes)

Jeon Yeong-bin (8 episodes)

Jeon Seok-dae (8 episodes)

Lee Jeong-chan (8 episodes)

Han Tae-hoon (8 episodes)

Na Baek-jin (8 episodes)

Kim Gil-su (8 episodes)

Go Hyun-tak (8 episodes)

Geum Seong-je (8 episodes)

Baek Dong-ha (6 episodes)

Do Seong-mok (6 episodes)

Baku's Father (6 episodes)

Si-eun's Mother (5 episodes)

Choi Chang-hee (4 episodes)

2-4 Homeroom Teacher (3 episodes)

Seoknam's Gorilla (3 episodes)

Kim Won-seok (2 episodes)

Child Park Hu-min (2 episodes)

Yeong-bin's Friend (1 episode)

Yeong-bin's Friend (1 episode)

Baseball Player (1 episode)

Yeong-bin's Mother (1 episode)

Police Officer 1 (1 episode)

Police Officer 3 (1 episode)

Kim Hui-jun (1 episode)

Jeong-chan's Friend (1 episode)

Child Yeon Si-eun (1 episode)

An Su-ho's Grandmother (1 episode)

School Principal (1 episode)

Homeroom Teacher (1 episode)

Psychiatrist (1 episode)

2-7 Homeroom Teacher (1 episode)

Police Officer (1 episode)

Baek-jin's Classmate (1 episode)

Detective (1 episode)

Orphanage Director (1 episode)

Production Design (8 episodes)

Storyboard (8 episodes)

Stunt Double (8 episodes)

Writer (16 episodes)

Director (16 episodes)

Editor (8 episodes)

Executive Producer (16 episodes)

Executive Producer (16 episodes)

Casting Director (8 episodes)

Executive Producer (8 episodes)

Unit Production Manager (8 episodes)

Original Music Composer (16 episodes)