Season 1

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. 

   1. You're Doomed

   2016-01-22 · 67m

   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. 

   2. We Still Have a Chance

   2016-01-23 · 66m

   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. 

   3. We Can Prevent the Killings

   2016-01-29 · 65m

   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. 

   4. We Found the Killer

   2016-01-30 · 65m

   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. 

   5. Changing the Past Alters the Present

   2016-02-05 · 68m

   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. 

   6. Catch Him by All Means

   2016-02-06 · 70m

   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. 

   7. We Must Dig Deeper

   2016-02-12 · 67m

   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. 

   8. How Are You Alive?

   2016-02-13 · 74m

   Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.

9. 

   9. Hongwon-dong Case

   2016-02-19 · 74m

   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. 

    10. Someone Has to Stop the Bad Guys

    2016-02-20 · 72m

    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. 

    11. The One Last Case

    2016-02-26 · 78m

    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. 

    12. The Case Was Manipulated

    2016-02-27 · 78m

    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. 

    13. The Real Assailant

    2016-03-04 · 74m

    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. 

    14. Not Now, but Maybe in the Past

    2016-03-05 · 74m

    Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty.

15. 

    15. Is It Really You?

    2016-03-11 · 72m

    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. 

    16. If You Don't Give Up

    2016-03-12 · 89m

    Hae-young is in critical condition after being shot while meeting with Sung-bum. In 2000, Jae-han has been captured by Bum-joo.