Episode guide
Signal: Season 1
16 episodes · first aired Jan 22, 2016
Communicating via a walkie-talkie that transcends time, a profiler from 2015 and a detective from 1989 join forces to tackle crimes and injustice.
- 1 You're Doomed Jan 22, 2016 · 1h 7m Profiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.
- 2 We Still Have a Chance Jan 23, 2016 · 1h 6m The statute of limitations is lifted after the suspect's arrest. Hae-young joins Soo-hyun's team for the newly established cold case squad.
- 3 We Can Prevent the Killings Jan 29, 2016 · 1h 5m Reality 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.
- 4 We Found the Killer Jan 30, 2016 · 1h 5m The 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.
- 5 Changing the Past Alters the Present Feb 5, 2016 · 1h 8m Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.
- 6 Catch Him by All Means Feb 6, 2016 · 1h 10m Seeking vengeance for the events that lead to the death of his daughter, Kyung-tae commits a kidnapping after getting out of prison for burglary.
- 7 We Must Dig Deeper Feb 12, 2016 · 1h 7m Jae-han arrests Se-kyu for the serial burglary case, but the culprit is freed after serving a short sentence; Kyung-tae still commits murder.
- 8 How Are You Alive? Feb 13, 2016 · 1h 14m Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.
- 9 Hongwon-dong Case Feb 19, 2016 · 1h 14m 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.
- 10 Someone Has to Stop the Bad Guys Feb 20, 2016 · 1h 12m The bodies discovered in the mountains appear to be more victims of the 1997 serial murder case. Jae-han learns that Soo-hyun became team leader.
- 11 The One Last Case Feb 26, 2016 · 1h 18m Hae-young and Soo-hyun arrest Jin-woo after coming to the conclusion that he is the killer. Hae-young asks Jae-han about the Inju rape case.
- 12 The Case Was Manipulated Feb 27, 2016 · 1h 18m Hae-young becomes a suspect for the murder of Chi-soo. Jae-han realizes who the principle offender of the attack on Hye-seung is.
- 13 The Real Assailant Mar 4, 2016 · 1h 14m Soo-hyun and the others mourn after confirming that the remains belong to Jae-han. Hae-young learns that Jae-han used to look after him in the past.
- 14 Not Now, but Maybe in the Past Mar 5, 2016 · 1h 14m Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty.
- 15 Is It Really You? Mar 11, 2016 · 1h 12m Hae-young is arrested for the murder of Chi-soo. Soo-hyun hears Jae-han apologizing over the radio for not being able to prevent Sun-woo's death.
- 16 If You Don't Give Up Mar 12, 2016 · 1h 29m Hae-young is in critical condition after being shot while meeting with Sung-bum. In 2000, Jae-han has been captured by Bum-joo.