Signal

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1. 1You're DoomedProfiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.67m
2. 2We Still Have a ChanceThe statute of limitations is lifted after the suspect's arrest. Hae-young joins Soo-hyun's team for the newly established cold case squad.66m
3. 3We Can Prevent the KillingsReality changes after Hae-young exchanges information with Jae-han. Hae-young tries to work together with Jae-han in 1989 to prevent the next murder.65m
4. 4We Found the KillerThe ninth victim is Won-kyung, the woman Jae-han loves. A driver turns himself in, but Soo-hyun and Jae-han determine that his son is the real killer.65m
5. 5Changing the Past Alters the PresentHae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.68m
6. 6Catch Him by All MeansSeeking vengeance for the events that lead to the death of his daughter, Kyung-tae commits a kidnapping after getting out of prison for burglary.70m
7. 7We Must Dig DeeperJae-han arrests Se-kyu for the serial burglary case, but the culprit is freed after serving a short sentence; Kyung-tae still commits murder.67m
8. 8How Are You Alive?Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.74m