Park Hae-joon

as Doctor at School Infirmary

as Oh Sang-jae

as Park Seon-chang

as Mr. Yoon

as Jong-woo

as Park Tae-soo

as Beom-soo

as Roh Tae-geon

as Loan Shark

as Kwon Tae-ju

as Tarobe

as Park Seon-chang

as Jang Junik

as Middle-aged Yang Gwan-sik

as Self

as Self

as Self

as Himself

as Mubaek

as Ryu Jung-seok

as Self

as Monk Gyeom-duk

as Cha Jin-soo

as Tae-seok / 6F