It is the best thiller I ever watched. I thought 20 episodes will be too many and it get boring but no the show was engaging from beginning till the end.

I could guess who is the killer after few episodes but still the show wasn’t boring and there are so many twists that you would not expect. It is a real shame that Yo Han had to die because I really like the character. The story is great.

After the brain sugery I started to sympathise with Ba Reum and stated to think if they did not trigger him would he became a killer? Lee Seung’s acting was amazing! In the end he got what he deserved but I could not help but felt sorry for him and wished for different ending.

I could not stopped watching the show. I finished it in few day!