FYI: this review contains S1&2
First of all let me say that netflix deserved their TENS for releasing this. Like this was the start of the high budget kdramas. Everything about this was wonderful. It's only 6 episodes long and so doesn't overstay its welcome in the slightest. It has some of the best visuals I've seen in a kdrama. The story is original and of course I'm going to be excited about a high budget zombie kdrama on netflix??? The actors all did what needed to be done. The pacing is a bit on the slower side and there's a little too much talking going on. I would've liked to see a bit more action. Other than that I don't really have any complaints.
S2 was even better than the first in almost every aspect. It's bigger and more action-packed but somehow the emotional beats hit harder than S1!