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Appearances
Signal
Main cast, played by Jo Jin Woong
- Episode 1x01: You're Doomed (Jan 22, 2016)
- Episode 1x02: We Still Have a Chance (Jan 23, 2016)
- Episode 1x03: We Can Prevent the Killings (Jan 29, 2016)
- Episode 1x04: We Found the Killer (Jan 30, 2016)
- Episode 1x05: Changing the Past Alters the Present (Feb 5, 2016)
- Episode 1x06: Catch Him by All Means (Feb 6, 2016)
- Episode 1x07: We Must Dig Deeper (Feb 12, 2016)
- Episode 1x08: How Are You Alive? (Feb 13, 2016)
- Episode 1x09: Hongwon Dong Case (Feb 19, 2016)
- Episode 1x10: Someone Has to Stop the Bad Guys (Feb 20, 2016)
- Episode 1x11: The One Last Case (Feb 26, 2016)
- Episode 1x12: The Case Was Manipulated (Feb 27, 2016)
- Episode 1x13: The Real Assailant (Mar 4, 2016)
- Episode 1x14: Not Now, But Maybe in the Past (Mar 5, 2016)
- Episode 1x15: Is It Really You? (Mar 11, 2016)
- Episode 1x16: If You Don't Give Up (Mar 12, 2016)