This is an upside-down world. From the perspective of the uptown area, it seems to be no different from the current world, except for the towering transparent elevator and a weird building on the outskirts that hears strange sounds from time to time. The lower city area is dilapidated and people live numbly. Unlike the exquisite life in uptown, people here never know which will come first, death or tomorrow.
Purpose: People protect their homes and country and fight against foreign enemies together