There are those who are born monsters, but there are also those who are made into monsters by people.
Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
Park Hae-young
Kim Gye-chul
Kim Bum-joo
Cha Soo-hyun
Hwang Ui-kyung
Ahn Chi-soo
Lee Jae-han
Park Sun-woo
Cha Soo-min
Jung Heon-gi
Oh Yoon-seo