Sonyeo Online

Shi-hoo Kim - Yoon-su, Chang-gil Moon - Executive director Park, So-dam Park - Ji-yun, Oh Hee-Joon - Hyung-jun, Kim Kwang-sub - Gwang-seop, Tae-hee Lee - Young-jun, Park Jin-Woo - , Jang In-sub - Young-jae, Seo Hyun-woo - Math teacher, Hee-Jung Han - Homeroom teacher, Jo Han-Chul - Clinic Doctor (as Han Cheul Cho) , In-gi Jeong - Hye Won's Father (as In Ki Jung) , Doo-Gyum Jung - Yoon-su's father, Ju Bong Ki - Young Jun's Father, Yoon Kyung-Ho -