After watching many of the Netflix original K-dramas, I was skeptical going into this one. Oh boy, I couldn't have been more wrong. It's been a while since I watched something that keeps you guessing all the time. Even if you really think you know what's coming next, this gives a little doubt that doesn't go away. I have to applaud the writers for creating a rare masterpiece. Everything about this is art - the cinematography, the production design, the timing, the music, the motive. One thing that I would emphasize is how, at the start, you can't understand the actions of the pension owners, but with time, everything starts to make more sense. If a tree falls in a forest and no one is around to hear it, does it make a sound?