One of the best dramas, the story is just crazy and shows the deep darkness that hides in our hearts. What would we do if we ca do something to the persons who hurt us, how far can we go?
There are some scientific researches that proves that our brain behaves the same way when we hate as we do when we love. As there are so many gift shops to buy nice and lovely presents for the persons we love, why shouldn't also be a shops to buy presents for the persons we hate ?
The suspense is great, acting as well, would have been good to have a decent OST, but oh well, can go without it as well.
Overall, this is a drama that gives you something to think about, I binged watch the full series, as I was too hocked up to leave it. For me it falls under great movies like Battle Royal, The circle, Lord of the flies, even Saw, is just about stirring the deep dark thoughts and showing the human nature.

A must watch.
Enjoy !