China

Known as the China Great Walled City, The Great Chinese Construct or just China, is the country with all the chinks.

History
When China's population grew too big, bigger and bigger buildings were starting to be made, closer and closer to each other, until there was basically no space left, streets where little crawlspaces between buildings and long since was the sky but one tiny square when looking up. Eventually, the buildings built bridges to one another, and those turned into corridors, until finally, everything fused to become one gigantic continent-sized building where every chinese person lived, known as the Imperial Construct.

However, even then they started to run out of space, so they started to dig, and building underground floors. By now the amount of floors of the entire thing was close to almost being 3 digits.

One day while mining, they found a strange being named the Giant Batmen. That's when the infection began, with those infected having two possible outcomes: Either, most commonly, become very sick and die, and posthumously reviving and becoming a Xombie, or in rarer cases, recovering and gaining increased strength, reflexes, and combat capabilities, becoming what is known as a Kung Flu Fighter. The CCP caught sight of this and seek to repurpose this to create a new army of weapons, and from terrible experiments using the Batmen DNA on test subjects, they created a superior warrior force even better than the Fighters, known as Kung Flu Masters.

Inside the Imperial Construct is almost always chaos. From time to time, a horde of giant batmen manage to breach and slaughter some of the population, but those who manage to survive have the chance to become Kung Flu Fighter. A Kung Flu Fighter may take many paths, and in some cases they even chose to fight against the CCP itself. This is why even when the CCP employs some KFFs, they generally dislike those created through breaches since they tend to rebel, and that's why they most of the time send Kung Flu Master teams to slaughter any one who survives a batmen breach event.

There is a legend among the chinese, that if a Kung Flu Fighter tries hard enough, they can become a Kung Flu Master out of their own effort, but the CCP spreads this as being a lie and makes anyone who preaches it dissapear.