So Si-min
Han Su-gang
Ko Jin-hyoung
So Young-taek
Lee Jae-gyeong
Jin-hyoung's Grandmother
Lee Gwon-joong
Byeong-jin
Lee Moon-gi
Park Jung-ho
Kim Jeong-gyu
Byun Jae-hyeok
Song Eun-gyo
Min-ji
Head Teacher
Seo Sang-woo
English Teacher
Math Teacher
Principal
Hye-gyeong
Chauffeur
Costume manager