as Lee Dong-joon
as Professor Sin
as Bong-sam
as Tae-geun
as Lee Je-hee Foundation Secretary
as Lee Taek-yeol
as Um Sun-gu
as Woodsman
as Kwon Ji-woong
as Choi Dong Joon [Ro Hee's great-uncle]
as Yoo Gyo-yeon
as Ji-eun's father
as No Yu Cheol
as Reporter Kang
as Designer Lee [Hyun Joo's father]
as Choi Young-hwan
as Lee Young Goon [Professor]
as Yun Taek Il [Seung Beom and Sun Ho's dad]
as Kang Joo-man
