Vertical Urban Cage

After resources are exhausted in the future, humans will be trapped in the "cage" of vertical cities: The bottom "rust belt" (layers 801-1000) is struggling with exhaust gas and poverty, the middle "gear area" (layers 201-800) is reduced to a production tool, and the top "cloud area" (layers 1-200) monopolizes resources. There is also a "core area" (1-10 underground floors) called the "Time and Space Cage", which is a prison specifically for "class rebels". Ai Si, a girl at the bottom, was thrown into the "time and space cage" in the core area because of her resistance to oppression. She met the physicist Darion and the top rebel Vera. The three discovered that the cage was symbiotic with urban energy, and that the top level used time and space technology to suppress dissidents, and the truth behind the "Great Collapse" was hidden—— Mid-level technical workers broke through the turbulence of time and space and the blockade of the mechanical army, destroyed the core of the cage, and triggered the collapse of the urban class. Eventually, the old order collapsed, and the survivors rebuilt civilization on the ruins.