I Want to Know Your Parents— Full Cast

Sul Kyung-gu

as Kang Ho-chang

Chun Woo-hee

as Song Jung-wook

Moon So-ri

as Gun-woo's mother

Oh Dal-su

as Do Ji-yeol

Ko Chang-seok

as Teacher Jung

Kang Shin-il

as Principal

Sung Yoo-bin

as Kang Han-gyeol

Nam Kee-ae

as Gyu-beom's grandmother

Lee Mi-eun

as E-den's mother

Yoo Jae-sang

as Gun-woo

Jung Yoo-ahn

as Yoon-jae

Jeong Taek-hyeon

as E-den

Roh Jeong-eui

as Ji-ho

Jung Seung-kil

as Police

Lee Bong-gyu

as Unknown