I happened upon a random Youtube clip of this drama which made me absolutely bawl my eyes out and want to watch this drama. I can say that the best parts of the drama are the vulnerable scenes with only the main leads as that's where we see the actors' good chemistry and skills.
The story has a good premise (basically a pandemic but with zombies) and I did read some of the webtoon it is based on. The side characters make really stupid decisions which I know is supposed to illustrate the classism between the more rich tenants and the poorer tenants in the apartment building, along with other personal issues the characters have, but goddamnit this is a zombie apocalypse and these people don't have a single ounce of logic. The main leads are officers so they use their power to boss around the tenants for the safety of the community, which can be considered abuse of power, but these people are so stupid, I can almost excuse this.
Overall, I would say watch this if you like zombie stories or a couple who are ride-or-die for each other, and maybe skip some parts by reading summaries.