Cast from No Mercy for the Rude

Shin Ha-kyun

Killa

Yoon Ji-hye

She

Kang San

Kid

Park Gil-su

Feces Weight

Koh Soo-hee

Hiccup

Ko Chang-seok

Piano

Kim Min-jun

Ballet

Yeo Jin-goo

Young Killa

Park Choong-seon

Knife Scar (uncredited)

Kim Byeong-ok

Ponytail (uncredited)

Kim Eung-soo

Director (uncredited)

Lee Han-wi

Curator Killer (uncredited)

Yoon Sul-hee

Tail Hair Girl (uncredited)