Good but way too long
This series would have been much better if it were 6, maybe 8, episodes instead of 12. The story was interesting until it began to drag out waaaaay too much. The same thing over and over and over again. The acting was good. It had a few scares and also some comedy mixed in.
It was about a disease that temporarily turns infected people into raging killers, much like if they were rabid. Extreme thirst included. The apartment complex of the stars of the movie went into lockdown and the story focused on a group in that lockdown and how it affected them. As I said, it would have been really good if it wasn't dragged out to 12 episodes.
I would recommend it to anyone who likes the Korean zombie genre. Just make sure to keep in mind that fast forward is an option at one point and you won't be missing much.