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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 13
The Cold Case Squad secretly reinvestigates the Injoo gang rape case. Lee Jae Han finds out the connection Park Hae Young has to the case.