Kang Shin-il

Cheol-soo's grandfather

김규리

Cheol-soo's mother

백성현

Cheol-soo's uncle

한수연

Yeong-hee's mother

Song Min-jae

Cheol-soo

Yu Oh-seong

Cheol-soo's father

Park Jun-hyuk

Young-hee's father

민서

Cheol-soo's aunt