All Cast

Ahn Ji-ho

Ahn Ji-ho

Hoon

Ahn Nae-sang

Ahn Nae-sang

Mu-jin

Yun Yoo-sun

Yun Yoo-sun

So-yeon

Uhm Ji-sung

Uhm Ji-sung

Byeong-tae

No Tae-yeob

No Tae-yeob

Gi-cheol

Shin Se-hwi

Shin Se-hwi

Yeon-hee

Kim Joong-ki

Kim Joong-ki

Teacher

Gu Bon-jin

Gu Bon-jin

Math

Park Eun-young

Park Eun-young

Byeong-tae's mother