Ha Jung-woo

Goo Joo-wol / Detective Ma Dong-wook

Gong Hyo-jin

Lee Hee-jin / Kim Hae-young

Yoo In-na

Soo-jung / Kyung-sook

Jo Hee-bong

Publisher Kwak / Detective Squad Chief Kwak

Lee Byung-joon

M

Ji Jin-hee

Goo Joo-ro

Kwak Do-won

Director Hwang

Seo Hyun-woo

Yi-gyu

Son Byeong-uk

Juwol's Homeroom Teacher

Jeon Su-ji

Art Teacher

Choi Won-tae

Baek Sun-il

Kim Jae-hwa

Joo-hee

Park Jun-myun

Baek Sun-young

Lee Jun-hyeok

Professor Jeong

Teo Yoo

Secretary