Shin Ha-kyun

as Killa

Yoon Ji-hye

as She

Kang San

as Kid

Park Gil-su

as Feces Weight

Koh Soo-hee

as Hiccup

Ko Chang-seok

as Piano

Kim Min-jun

as Ballet

Yeo Jin-goo

as Young Killa

Park Choong-seon

as Knife Scar (uncredited)

Kim Byeong-ok

as Ponytail (uncredited)

Kim Eung-soo

as Director (uncredited)

Lee Han-wi

as Curator Killer (uncredited)

Yoon Sul-hee

as Tail Hair Girl (uncredited)