S1 E9: Hae-young learns that Chi-soo and Jae-han met in 1999 during a case in Inju. After serving time for the crime, Hae-young's brother had killed himself.
Communicating via a walkie-talkie that transcends time, a criminal profiler from 2015 and a detective from 1989 join forces to tackle crimes and injustice.
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