하정우

Goo Joo-wol / Detective Ma Dong-wook

공효진

Lee Hee-jin / Kim Hae-young

유인나

Soo-jung / Kyung-sook

조희봉

Publisher Kwak / Detective Squad Chief Kwak

이병준

M

지진희

Goo Joo-ro

곽도원

Director Hwang

서현우

Yi-gyu

손병욱

Juwol's Homeroom Teacher

전수지

Art Teacher

Choi Won-tae

Baek Sun-il

김재화

Joo-hee

박준면

Baek Sun-young

이준혁

Professor Jeong

태오

Secretary

김지훈

Detective

박영수

Young-shik / President Jo

차은재

Hair shop