퀴즈왕

한재석

Sang-kil

김수로

Lee Do-yeop

류승룡

Kim Sang-do

장영남

Jang Pal-nyeo

류덕환

Oh Cheol-ju

심은경

Kim Yeo-na

임원희

Lee Joon-sang

신하균

Doctor of Engineering

정재영

Man in Taekwondo uniform

장진

Captain Ma (uncredited)

공호석

Officer Gong (uncredited)

안수호

Bureau Director (uncredited)

한예주

Han Soon-kyung

박경만

Park Joon-seo

Park Jeong-gi

Police