I honestly enjoyed this.
The monsters were interesting (and sometimes even funny). The plot was well executed but you do need to keep in mind that though this is an adaptation of the manhwa/webtoon that doesn't mean it'll be the same scene by scene. This had in a way more depth than it's comic version. You feel a lot closer to each character. But you can watch this without knowing anything about the original webtoon.

Also, need to say I'm a fan of gore so if you get queasy at the sight of blood then you should probably stay away from this...

The CGI was obvious most of the time but in a way that you didn't really care. The story and acting sucked you in and the rest just looked cool or something along those lines ^.^
(also actors/actresses were really pretty so it was easy on the eyes ...Unless you count the monsters... and the blood... Actually, this was pretty rough on the eyes... The PEOPLE in this were pretty?)
Loved the stunts! Everything looked so real! I can just imagine the fun they had filming this.

It was so easy to watch that I accidentally on purpose binge watched this (the whole season) <3
But that can also just be because I was already familiar with the story and waited for this.
There were some funny easter eggs included for the fans. The music was rather random but I suppose it matched the mood.

I'm not entirely sure because my memory is sh*t but I feel like they created new characters for this but please don't trust me on that... The story was definitely different (slightly?).

To those that hate to watch stuff online for free (totally illegally) then your in luck.
You can find the whole season on Netflix.

Anyway definitely recommend this! Have fun~