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Appearances
Signal
Guest cast, played by Lee Do Yup
- Episode 1x03: We Can Prevent the Killings (Jan 29, 2016)
- Episode 1x04: We Found the Killer (Jan 30, 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)