(SPOILERS AHEAD!)
I think the filming style and technique was unique. I enjoyed the first 3-4 episodes where the story stayed on track of it's theme, but the further it progressed the more outrageous it got. I'm not used to this style, after watching ones like 'Train to Busan' and 'All of us are dead'.
This definitely isn't for everyone, the storyline is a bit inconsistent with its zombies and just plot in general, I thought characters like Noh Hong Chul were a bit confusing. At first he seemed like a good samaritan who'd risk his life and suddenly changed to a selfish person. I did like how the director allowed the cast to be themselves pretty much throughout the filming, which gave a light feeling to such a dark theme. They allowed the characters to keep their real names in the script, instead of pretend ones, which isn't common, which gave it (for some reason) a better chemistry between comfortability, cast and what not.
Overall was fun to watch if you like a bit of humour and just overall craziness, I just think at times the craziness did overload the realism and instead of feeling like you were watching a show of them surviving through missions, it sometimes felt like they were doing a prank on one another, (If you watched it maybe you'll understand where I'm coming from). Again, this is my opinion and some people may say otherwise. We all have different styles, tastes and opinions.