This drama was good to watch, I won't lie. There was a good plot, I personally didn't find any plot holes, and I liked how each episode focused on different victims of the teacher instead of multiple episodes on person or vice versa.

Ye Rim's role kind of confused me, nothing really happened to her. All she did was figure out that something weird was going on because of the stuff her classmates left behind before they disappeared. Sang Woo is cute, always calling Ye Rim wife. Teacher Han's role also confused me, like was this man a demon or not? And when Ye Rim saved everyone, he just...I don't know how to explain it without spoiling it, but he did what he did. I liked the stories of the other students, they were realistic in a way. I liked Do Hee's story especially, I would like a book like hers, but I know better than to actually accept on if it ever came to it.