One of the things that caught my attention was the supernatural element in the drama. Kim Wook and another character, Jang Pan Seok, can see and communicate with the souls of the missing people. It adds a whole new layer of mystery and intrigue to the story. Police detective Shin Joon Ho's missing fiancée, who was also an orphan, adds another layer of complexity to the plot. It seems like being an orphan puts them all in danger. I'm really curious to find out why they're being hunted down and murdered.