Season1
A series that deserves much more success. A season 1 too short unfortunately, but six intense episodes. The cast plays very well (there is Bae Doona, an actress whom I like very much!), The characters are interesting, the concept of zombie apocalypse in a medieval era and very well found, and the political intrigues add to the tension all the way. The best zombie show I have seen, personally. A beautiful little South Korean masterpiece that has nothing to envy to big Hollywood productions.
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Season 2
Kingdom doesn't reinvent the wheel, but it does add new twists to the zombie mythology by introducing the quasi-vampiric nature of its flesh-eaters.