The story is about a woman who becomes the main character after getting a scratch from a zombie. The zombie origin is from drugs that have already been distributed all over the world. The woman then survives along with her boyfriend and the people who live in the apartment. But, the military locked the apartment to make sure that no one is come out. This is where the story becomes interesting.

Sadly there are not many zombies like swarm zombies. It's only a dozen of zombies that they have taken on this K-drama.

I thought that the ending is... Just watch it by yourself XD

It's recommended to those who like zombies but not the hardcore one :)