This movie kept me on my toes!

Lee Min-Ki really embodied the role of a serial killer. It was amazing! I didn't know whether or not I wanted him to get away with it or get caught!

It really made you question 'Is he actually the monster or is it his family's fault?'

The story plot is GREAT.

Even with Book-Soon (Kim Go-Eun) having a mental disability; she stuck to what she wanted to do in the end, avenge her sister and save Na-Ri.

I like how Book-Soon and Na-Ri in the end was singing the song, Book-Soon sung with her sister.