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2 Musim
17 Episode
시그널
- Tahun: 2016
- Negara: South Korea
- Aliran: Kejahatan, Misteri, Sci-fi & Fantasy, Drama
- Studio: tvN
- Kata kunci: corruption, investigation, murder, tragic past, butterfly effect, dark, suspense, thriller
- Direktur: 김은희, Kim Won-suk
- Pemeran: 이제훈, 김혜수, 조진웅, 장현성, 정해균, 김원해