Seoulyeok

Even if it is animated, the characterizations and dialogue are pretty good including the facial animation.

The tension builds slowly and spares some time for some exposition but it creates a very effective atmosphere of slowly growing paranoia and fear.

There are enough interesting twists to keep you engaged until the ending and the climax is pretty dark. Like most apocalyptic films it has a final decision that you didn't see coming.

This is the first animated zombie film I have ever seen so I have to rate it the best. Well worth watching.