The center of the story revolves around an elderly detective who is planning to retire. However, his plans are disrupted by a mysterious individual who stands in his way. The stranger conceals his identity. A true psychological war ensues between the two characters, with only one of them emerging victorious. One day, the detective receives a mysterious phone call from a "friend" that forces him to delve into his dark past. As a result of this call, the main character becomes the prime suspect in the murder of his colleague.