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Appearances
Signal
Guest cast, played by Kim Jong Goo
- Episode 1x01: You're Doomed (Jan 22, 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)