I said that Kingdom and Happiness are the best zombie drama. I will say All of Us Are Dead is the best zombie drama too but in a school drama genre.

Additional WARNING that Netflix doesn't tell you:
- It contains sexual graphics (a naked girl shot from behind) in one of the episodes.
I think I should write this in case you are looking for information about whether it's safe to watch it with family <3

Pros:
- Cho Yi Hyun is badass af. She carried the whole drama. Been a fan since she's in Hospital Playlist <3
- School-themed drama. So, the origin of the zombies can seamlessly be explained with scientific theories.
- Creative conflict problem solutions that the watchers don't expect
- Good amount of teen romance stuff
- Not too much comedy but it naturally is there.
- Pretty solid plot. Each episode will make you stay awake and aware. The atmosphere is so intense.
- Realistic dilemma choices faced by the students in the conflicts.
- Zombie species is developed well. You won't find this development in any drama before.
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Cons:
- Some plot holes are there (like why this student faces this kind of problem etc are not explained) but somehow the entire plot can bury those.
- Main leads failed to lead the show. I don't know if this is a good or bad thing. But I gratitude they failed. Choi Namra is a hard carry in this drama! <3
- Production team forgot to explain the details of how to kill the zombies like killing titans in Attack on Titan where everyone must slice the titans' neck. In this drama, sometimes, the zombies die by getting stabbed on the body, getting sliced on their neck, getting shot on their head, etc randomly. The explanation I remember is that they will die when the "host" body is destroyed. But, their "host" body isn't destroyed until the near end of the drama. So, those high schoolers actually didn't kill the zombies and just stunned them?
- Unnecessary sexual violence scene (a naked girl that has been bullied).
- There is no epic music :(
- Shibal, there is too much cursing. It's much better if you don't understand Korean lang.
- We need to wait for the next season to see how the plot ends.
- The writer is obviously forcing them to get trapped in the school lmao.

Extra:
Why majority of watchers love Namra more than On Jo? I think it's because Namra's role is the key to their survival while On Jo is always crying all the time and seems cannot live without people around her. So, I hope the writer does justice for the main leads.