17세의 조건

Seo Jeong-yeon

Jeong-kyeong

박시은

An Seo-yeon

이항나

Lee Hae-young

Yoon Chan-young

Ko Min-jae

백승환

Kang Ki-hyeon

Kim Jong-tae

Min-jae's Father

Park Se-hyun

Jung Yu-ri

Choi Dae-hoon

Choi Soo-hwan

오동민

Homeroom Teacher

정찬비

Han Ju-mi

Baek Ji-won

Doctor

Park Sung-Geun

Hae Young's boyfriend

Jung Hee-tae

Seo Yun's father

Son Kwang-Eop

Jung Kyung's boyfriend

강서하

Chemistry teacher