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Elite detective Do Chi Kwang, known for his wisdom and accomplishments, realizes how corruption corrupts the system. He also leads the internal affairs investigation team, where he meets Kim Young Goon—a cold but actually warm cop—who is involved in a tragic affair with him. Together with Han Tae Joo, a former prosecutor who survived a dangerous case, they uncover the dark truth behind a series of crimes. With tensions running high and secrets lurking, the trio must face a greater danger than they thought. by Ha Jin is the soundtrack that deepens the mysterious atmosphere.