스무살

이유리

Chae-ri

Gong Yoo

Joon

Shoo

Soo-young

Jung Sung-yoon

Tae-hyun

Moon Ji-yoon

Sang-hyuk

임성언

Min-hee

조달환

Seok-goo

김용건

Sang-hyuk's Father

이미영

Sang-hyuk's Mother

김지우

Song-yi

Yoo Seo-jin

Professor