Character Name : Goo Joo-wol / Detective Ma Dong-wook

Original Name : 하정우

Gender : Male

Character Name : Lee Hee-jin / Kim Hae-young

Original Name : 공효진

Gender : Female

Character Name : Soo-jung / Kyung-sook

Original Name : 유인나

Gender : Female

Character Name : Publisher Kwak / Detective squad chief Kwak

Original Name : 조희봉

Gender : Male

Character Name : M

Original Name : Lee Byung-joon

Gender : Male

Character Name : Goo Joo-ro

Original Name : 지진희

Gender : Male

Character Name : Director Hwang

Original Name : 곽도원

Gender : Male

Character Name : Ui-Gyu

Original Name : 서현우

Gender : Male

Character Name : Juwol's Homeroom Teacher

Original Name : Son Byeong-uk

Gender : Male

Character Name : art teacher

Original Name : 전수지

Gender : Female

Character Name : Baek Sun-il

Original Name : Choi Won-tae

Gender : Male

Character Name : Joo-hee

Original Name : 김재화

Gender : Female

Character Name : Baek Sun-young

Original Name : 박준면

Gender : Female

Character Name :

Original Name : 이준혁

Gender : Male

Character Name : Secretary

Original Name : 유태오

Gender : Male

Character Name : Detective

Original Name : 김지훈

Gender : Male

Character Name : Young-shik / President Jo

Original Name : 박영수

Gender : Male