A woman is brutally murdered, stripped naked with tape wrapped around her head; with no evidence found, Ji-hoon finds similarities between this case and the unsolved "ghost case" from seven years ago.

A woman is brutally murdered, stripped naked with tape wrapped around her head; with no evidence found, Ji-hoon finds similarities between this case and the unsolved "ghost case" from seven years ago.

A woman is brutally murdered, stripped naked with tape wrapped around her head; with no evidence found, Ji-hoon finds similarities between this case and the unsolved "ghost case" from seven years ago.

A murder case of four family members living in a mansion happens; the only person who survives at the site is a grandma in her 70s, but due to Alzheimer's disease, she doesn't remember anything of the crime or the crime scene.

A hostess known for her beauty is murdered; having known people of great power and wealth, she was the queen of authority who knew many secrets which had the potential to shake the political world.

A corpse of a woman is found in the forest; the investigation team falls into great shock at the sight of the brutally destroyed body; they suspect it's a serial murder case as it happened the same way of the murder case from two months ago.