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With Kwak Min Soo in the grasp of law enforcement, the situation is turned on its head when someone gets through their safe walls. An old man finds the suicide of his friend, but nothing is as it seems.
First Air Date : Jan 14, 2017
Last Air date : Jul 31, 2021
Episode : 58 Episode
Season : 4 Season
Runtime: 60:14 minutes
Studio: OCN
Country: South Korea
