The Country of Zombies

I originally wanted to name Zombie Dynasty, but because of the reminder: someone has already written this masterpiece, let me change the name. I changed it to the country of zombies, thinking that no one would have ever given such a crude name. It tells the story of a zombie virus outbreak in South Korea, and a high school in the countryside who uses the school as a fortress to fight the zombies in order to survive. Since this has never happened in reality, the story is set in Parallel Universe 44.