Hyperbola of Youth

Hwang Hae

Kim Myeong-ho

Hak-Ja Ji

Kim Jeong-ok

Lee Bin-hwa

Lee Min-ja

Yang Hoon

Lee Bu-nam

Bok Hye-suk

Myeong-ho's mother

Ji Bang-yeol

Bu-nam's father

Go Seon-ae

Bu-nam's mother

Seok-cheon Yang

Fiancé of Min-ja

Kim Hee-kap

Jigekkun ajeossi (coolie)

Yun-su Gyeong

Jin-hui Kim

Suk-ja Kim

Nurse

Min-ja Kim

Nurse

Ae-ja Kim

Nurse

O-heon Kim

Si-chun Park

Doctor (special appearance)