Shin Hye-sun

So Si-min

Lee Jun-young

Han Su-gang

Park Jung-woo

Ko Jin-hyoung

Lee Chan-hyeong

Lee Gwon-joong

Park Hyuk-kwon

So Young-taek

Cha Chung-hwa

Lee Jae-gyeong

Son Sook

Jin-hyoung's Grandmother

Bae Hyeon-jun

Byeong-jin

Cha Woo-min

Lee Moon-gi

Kim Sang-woo

Park Jung-ho

Lee Tae-hee

Kim Jeong-gyu

Lee Tae-gyun

Byun Jae-hyeok

Kang Anna

Song Eun-gyo

Kang Na-ru

Min-ji

Lee Gyu-hoe

Head Teacher

Lee Jung-ok

Seo Sang-woo

Dong Hyo-hee

English Teacher

Nam Jeong-woo

Math Teacher

Kim Gyeong-ryong

Principal

Lee Do-eun

Hye-gyeong

Choi Ri-ho

Chauffeur

Lee Joo-mi

Costume manager