Shin Hye-sun
So Si-min

Lee Jun-young
Han Su-gang

Park Jung-woo
Ko Jin-hyoung

Park Hyuk-kwon
So Young-taek

Cha Chung-hwa
Lee Jae-gyeong

Son Sook
Jin-hyoung's Grandmother

Lee Chan-hyeong
Lee Gwon-joong

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