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Season 1 Jan. 22, 2016
- Episode 1: You're Doomed
- Episode 2: We Still Have a Chance
- Episode 3: We Can Prevent the Killings
- Episode 4: We Found the Killer
- Episode 5: Changing the Past Alters the Present
- Episode 6: Catch Him by All Means
- Episode 7: We Must Dig Deeper
- Episode 8: How Are You Alive?
- Episode 9: Hongwon Dong Case
- Episode 10: Someone Has to Stop the Bad Guys
- Episode 11: The One Last Case
- Episode 12: The Case Was Manipulated
- Episode 13: The Real Assailant
- Episode 14: Not Now, But Maybe In The Past
- Episode 15: Is It Really You?
- Episode 16: If You Don't Give Up
Signal Season 1 Episode 15
Park Hae Young is framed and arrested for the murder of the Section Chief. Cha Soo Hyun sets out to save Lee Jae Han and to find the one witness who can bring down their enemy.