I think this can be considered a modern classic, the best that can be produced from asian genius.
A gruesome tale with twist upon twist of revelation, Need to be seen to believe. Even better than The game or Memento.
"You know now that I'm the one who responsible putting you in solitary confiment for 15 years, I want you to find the WHY since you already know the WHO"
You think this movie will end when the movie reveal the WHY. You're totally wrong and you're sure going to be speechless once you know the other WHY behind the WHY
Revenge is best serve cold - totally wrong, Revenge is best serve cold and ALIVE