Lots of fun if you leave the brain out of it. Do not try to understand it or find a logic behind anything, coz it ain't there. The whole premise of the show is built on misconception about a certain topic.

That said, I had lots of fun for the majority of watch time. They committed to the gruesome and violent scenes and questionable/ evil characters. I watched it and asked - is this really Korean? Where they censor and blur knives from scenes?

Editing was spectacular, except for some special effects, but I'm picky about these. Most people would probably love them. The fighting scenes were well choreographed, but it was the editing that added that special and unique edge to them. And the violence was... well, violent. Ain't some random few punches here and there.

The acting was for sure the strongest aspect after the directing and editing. Kim Da Mi's performance truly amazed me, especially closer to the ending. She showed a lot of skills and duality in her acting. Truth to be told, the whole cast did an amazing job. I was frustrated with the random English lines here and there, especially since Netflix does not provide subs for them, and as a not native speaker, with the accent, I did have some problems with understanding some of them...

So what went wrong?
The reasoning, explanations and motivations of the characters were all over the place. I enjoyed the movie up till the moment they tried to explain what exactly is going on. Why? Coz the explanation was simply dumb. They gave the same excuse many low sci-fi movies give, which was proven false countless times. Still using it, in my eyes, means lazy and unoriginal writing.

Was it a good movie? Yes, just do NOT think as you watch.