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Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
Lee Je-hoonPark Hae-young
Kim Hye-sooCha Soo-hyun
Cho Jin-woongLee Jae-han
Jang Hyun-sungKim Bum-joo
Jung Hae-kyunAhn Chi-soo
Kim Won-haeKim Gye-chul
