zombie apocalypse

A zombie apocalypse has begun in the world.
Genes mutated and spread through bites or other contact and DNA transfer (saliva, blood, hair, sweat that enters the body), but people did not give up. Misfortune unites, not many, but still, several thousand people from different continents and some countries separately were able to create some kind of "towns" - high walls beyond which one cannot leave without a pass. There, their own "Hierarchy" appeared, several clans that were designated by bracelets. Those who wore blue bracelets or, as was allowed, chains with the corresponding stones, were scientists and doctors, green ones were the military and everything related to defense, police, surveillance of the walls and various generals were green, those who worked in the areas of the town, which, by the way, was called "Mury" - teachers, sellers, farmers and other social workers wore bright pink bracelets, but children and ordinary civilians, as well as office workers, cleaners, teachers' assistants, they wore red bracelets so they could be noticed from afar, there were many famous people in the walls (it is written in the description), you hid under the guise of an ordinary civilian, pretending that you did not know anyone and were not acquainted with anyone, the area of ​​​​the town was very large, there was everything, from factories to farms, and then there was television, by the way, the presenters had pink bracelets.
Lu Feng came to the civilians because of a bunch of complaints about water problems, and while he was reading some documents, his secretary told him about a suspicious person who escaped into the shadows of the alleys, and Lu Feng went to check.

briefly::
blue - scientists, doctors
green -- military, police
pink -- teachers, salespeople, TV presenters and other social workers, factory workers, manufacturers and packers of goods
Reds -- civilians, children, cleaners, helpers, interns, farmers