Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
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Lee Je-hoon
Park Hae-young
Kim Hye-soo
Cha Soo-hyun
Cho Jin-woong
Lee Jae-han
Jang Hyun-sung
Kim Bum-joo
Jung Hae-kyun
Ahn Chi-soo
Kim Won-hae
Kim Gye-chul
Jung Han-bi
Oh Yoon-seo
Lee Yoo-jun
Jung Heon-gi
Kim Min-gue
Hwang Ui-kyung
Kang Chan-hee
Park Sun-woo
All 16 episodes plotted by IMDb rating
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16 episodes • 2016Avg: 8.1Golden Era
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | You're Doomed | Jan 22, 2016 | 8.4 |
| 2 | We Still Have a Chance | Jan 23, 2016 | 8.2 |
| 3 | We Can Prevent the Killings | Jan 29, 2016 | 8.0 |
| 4 | We Found the Killer | Jan 30, 2016 | 8.0 |
| 5 | Changing the Past Alters the Present | Feb 5, 2016 | 7.5 |
| 6 | Catch Him by All Means | Feb 6, 2016 | 8.0 |
| 7 | We Must Dig Deeper | Feb 12, 2016 | 7.8 |
| 8 | How Are You Alive? | Feb 13, 2016 | 8.6 |
| 9 | Hongwon-dong Case | Feb 19, 2016 | 8.4 |
| 10 | Someone Has to Stop the Bad Guys | Feb 20, 2016 | 7.8 |
| 11 | The One Last Case | Feb 26, 2016 | 7.8 |
| 12 | The Case Was Manipulated | Feb 27, 2016 | 8.2 |
| 13 | The Real Assailant | Mar 4, 2016 | 8.0 |
| 14 | Not Now, but Maybe in the Past | Mar 5, 2016 | 8.0 |
| 15 | Is It Really You? | Mar 11, 2016 | 8.0 |
| 16 | If You Don't Give Up | Mar 12, 2016 | 8.4 |
