I will make this short review. This is the story of Cha Hyun Soo and the residents of his building. One day suddenly people turn into monsters and they have to survive in this building at all costs.

To be honest, it's the typical kind of series with the monsters. Besides, I would have liked the monsters to have less CGI and more prosthetics, but it's probably a question of budget. We discover that among the people who transform, they can keep a human part and reason but for that they must fight in their mind to not give up to the monsters, it's a curse.
This is what Hyun Soo does, he resists and becomes a special kind of monster, very valuable. I don't want to reveal too much, but I like the story they found for him, and it's not just people fighting in a building against monsters. Many people die, and the essence of the series is our protagonists creating a community and trying to survive day to day, sometimes without water or electricity.

So the script is quite simple. On the other hand, they added characters over time that made the series finale interesting and further, which holds promise for future seasons.

I also want to mention that Song Kang did a good job in his acting again, I wouldn't say he showed it all, but this series is really a stepping stone for him and his future career. He is really talented.

If I had to summarize, it's not a super complicated story, it's more based on action and the survival of the characters, it is nice.

So I'm looking forward to the sequel.