Explores themes of loneliness, gaslighting, the pressures of conforming in society, of social hierarchies, of the weight of expectations, of the urge to build comforting relationships & of insanity and how easy it is to slip down into the darkness when all the touchstones keeping a person sane or normal begin to fall apart.

And all wrapped up in an excellent horror show that ups the fear & creep factor to eleven using clever directing, music but especially character work. Every actor here is excellent and whilst Im Siwan & Lee Dong Wook are the obvious stars, the supporting cast are all so real and well portrayed that you'll completely fall into the show from the moment it starts.

I dare anyone not to binge watch, it's impossible! And at 10 episodes it's tightly plotted too with it never suffering the kdrama problem of having a slow middle. Then again, whilst I wouldn't say the middle was slow, I did find myself a little bored through certain scenes in the first half. Maybe I wasn't emotionally attached enough or maybe I was just waiting for the set-pieces to arrive.

Overall though every episode left me running to watch the next one and watching the whole thing was as frustrating & heartbreaking as it was fascinating & captivating.

Highly recommend for lovers of horror, crime & dark shows. Also for anyone who loves shows that are a little deeper or heavier with heaps of symbolism and clever writing thrown in.