Shin Hye-sun

Character: So Si-min

Lee Jun-young

Character: Han Su-gang

Park Jung-woo

Character: Ko Jin-hyoung

Park Hyuk-kwon

Character: So Young-taek

Cha Chung-hwa

Character: Lee Jae-gyeong

Son Sook

Character: Jin-hyoung's Grandmother

Lee Chan-hyeong

Character: Lee Gwon-joong

Bae Hyeon-jun

Character: Byeong-jin

Cha Woo-min

Character: Lee Moon-gi

Kim Sang-woo

Character: Park Jung-ho

Lee Tae-hee

Character: Kim Jeong-gyu

Lee Tae-gyun

Character: Byun Jae-hyeok

Kang Anna

Character: Song Eun-gyo

Kang Na-ru

Character: Min-ji

Lee Gyu-hoe

Character: Head Teacher

Lee Jung-ok

Character: Seo Sang-woo

Dong Hyo-hee

Character: English Teacher

Nam Jeong-woo

Character: Math Teacher

Kim Gyeong-ryong

Character: Principal

Lee Do-eun

Character: Hye-gyeong

Choi Ri-ho

Character: Chauffeur

Lee Joo-mi

Character: Costume manager