Zombie King is a Manga/Manhwa/Manhua in (English/Raw) language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Do they know this is the method to save the world? They know… Why do they try to stop us then? Because they are accustomed to exploitation… What should we do? Give them a little shock of zombies!