Very well done.
1. Nice story and plot, very well paced and giving a little twist at the end
2. Great acting from all the casts, and I'm now waiting for Jun Ji Hyun appearance on season 3 :)
3. And still the production team maintain the good job!

One downside is that as frequently happen on all move / drama, the main heroes will never die... Facing so many zombies, how can he / they / she escaped un-scratches. Seo Bi in prison, how can she survived. But still overall this is a nice drama to watch, not too long (so that not dragging), good story and good acting.