Lee Soo-kyung
— Yong-soon
최덕문
— Father
박근록
— PE Teacher
김동영
— Bbak-gyu
장햇살
— Moon-hee
Choi Chan-sook
— Che-yook's Mother
김자영
— Moon-hee's Mother
Park Chul-min
— Chief of School Administration
김민재
— Music Teacher
Choi Yeo-jin
— English Teacher
김응수
— Principal
Kim Han-na
— Athletic Club Senior
Kim Ha-yeon
— Young Yong-soon
김영재
— Birth Mother's Old Love
Lee Na-ra
— Birth Mother
Park Ji-yeon
— Art Teacher
Jang Hye-jin
— Middle-aged Woman
Kim Keum-soon
— Supermarket Worker
나애진
— Athletic Club Member
한사명
— New Gym Teacher
Woo Yeon-seo
— Ethics Teacher