I watched for the amazing main leads, they were absolutely awesome, an absolute power couple! Sure, the actions of many of the other characters seemed stupid, but in such a high-pressure environment, it's inevitable. I was really sad about some deaths, especially when some really didn't deserve it, that made me say, but perhaps that's just how life is.

It felt like this apartment complex in lockdown was like its own self-contained world, each character reflecting the different types of people and choices that would realistically happen in the larger world, but on a smaller scale. Meanwhile, at least our leads weren't stupid, and I loved them for being calm, rational, intelligent, and an awesome pair! Honestly, MVP goes to Han Tae Sook, his character was seriously awesome in my opinion. In a sense, without his decisions and his intelligence, maybe things wouldn't have turned out as well as he did.

No one's ever black and white in this story, and I love how this show doesn't push ethics in our faces. I think there's definitely a lot of ethical issues with the way people handled things, the obvious and not-so-obvious issues, but each character was never either black nor white, even our leads, because they were willing to see the world burn for each other lol (well, not really, kinda towards the end, but even if they did just want to watch the world burn happily and do nothing about it, I'd be on their side HAHA). And honestly, it made me truly think about this world as a whole - we can blame people all we want for making certain potentially bad decisions, but we never know what drives them to do what they do, and sometimes, that could simply be love for your wife. Selfish as it may be, I honestly can understand these motives.

Then there are the absolute devils that deserve to literally burn with no way of redemption. >.> No pity for them. Sometimes the 'normal' humans are the monsters, not the zombies. No surprise there.

Then again, there's also no need to think too deeply imo, just like how it doesn't push ethics in our faces, it can make us viewers think about issues, but it's really not THAT heavy. I've watched others with much heavier exploration of humanity, although I can't remember any off the top of my head.

Anyways. I don't think it's perfect, but scores are always subjective. I'm giving it a 10/10 because I highly enjoyed it. Romance definitely wasn't the focus, at least, it wasn't pushed in your face, but with the way the two leads cared for and thought of each other, it was just as romantic as kisses. Romance was more prevalent in the last two episodes for sure, but it was there throughout, and I genuinely love such a tacit, understanding pair that would protect each other so naturally. Anymore romance drama in this sort of show would've ruined it. Sure, maybe I'd have liked a bit more romantic moments, but I prefer this than those where the writer ruins a romance by causing unnecessary conflicts between the two leads - that ALWAYS ruins it for me, ESPECIALLY when they're meant to be intelligent, calm, and reasonable ADULTS.

Give it a watch if you enjoy some zombies, mystery, a virus, contemplating human nature (although, really, it wasn't overly heavy), and a speck of romance that's obviously there through their mutual understanding and friendship with each other and the last two eps. It was enjoyable and honestly, if you can just focus on the two leads and be happy with them being the logical and intelligent ones (and the adorable kid Seo-Yoon) most of the other characters' stupid/misinformed/interest-fueled actions isn't that big of a deal. I enjoyed watching the complexity of human nature in them actually.