Yes, there are some little plot holes - I'll get to those later - but overall, this was amazing. There were episodes where I was completely glued to the screen and did not dare to move. I've watched many zombie shows and movies but this is now by far my favorite. The drama starts out good, then becomes really amazing and fast-paced, then there's one episode that is slower and less plot-driven, but it is a nice breather before the final few action-filled episodes.

The young actors all did amazing jobs bringing these characters to life. The good characters, as well as the bad, that viewers really really hate. I found On Jo kind of annoying but I guess that's part of her character. I loved that there was no plot armor and anyone could die at any time - major characters included.

I guess the only questions I had are the following:
- Does anyone who gets bitten by Gwinam only turn into a "Hambie"? The characters assume this, because both Gwinam and Namra, who was bitten by him, are Hambies. And Soohyeok even says to Namra "If you bite me, I will only turn into what you are." But then why did Nayeon, who was also bitten by Gwinam, turn into a full zombie??
- If you have Namra in your group, who is immune to the Zombies, why not just let her bite everyone in the group in order to get out of the school? Kind of like a vaccine?
- Did all her friends forget that On Jo got bitten by that first girl who got bitten by the hamster? Shouldn't she have turned into either a Hambie or a Zombie, or be immune to everything? Maybe the second season will reveal that she's got like super-immunity, but why did none of her friends stop and think "hey, didn't you get bitten?"