Once, Xiao Yi and his fellow zombies were trapped in an abandoned library, surrounded by a relentless swarm of zombies. In this seemingly hopeless situation, Xiao Yi picked up a book from the shelf and quietly began to read. His fellow zombies stood guard around him, protecting him from the zombies' attacks. In that moment, the library became his safe haven, and books his strongest shield.

Xiao Yi used knowledge to pass the boring time one after another, and continued to grow and improve in the process. He became more wise, brave and determined, and became a unique landscape in the end times.

Under the shadow of the apocalypse, the world above ground has become a paradise of zombies and ruins. To survive, humanity is forced to retreat underground, seeking a glimmer of peace. As time passes, social civilization gradually begins to build in the underground city, and amidst this darkness, humanity ignites the flames of civilization.

The creation of underground cities wasn't a one-time undertaking; it took countless attempts at exploration and experimentation. Initially, people simply dug caves and built crude dwellings. Over time, however, they learned to utilize underground resources, planning urban layouts and constructing more durable and comfortable living environments.

Leaders play a crucial role in the Dungeon's social structure. They must possess not only exceptional leadership skills but also extensive knowledge and experience to respond to various emergencies. They are responsible for establishing rules, maintaining order, and ensuring the Dungeon's safety and stability.

The underground city's economy flourished. People began to exploit the rich mineral resources and energy resources underground to develop industry and agriculture. They cultivated unique underground plants and raised animals adapted to the subterranean environment, providing food and raw materials for the underground city. At the same time, various handicrafts and mechanical products emerged in the underground city, becoming important commodities for trade.

Culturally, underground cities also possess a unique charm. Though living underground, their people never cease their pursuit of beauty. They create music, paintings, and sculptures, using art to express their innermost feelings and aspirations for the future. At the same time, they preserve some of their cultural traditions above ground, passing this precious heritage on to future generations through oral traditions and written records.

Though its social civilization began relatively late, the underground city's rapid development is astonishing. Amidst this darkness, humanity, with wisdom and courage, ignited the flames of civilization, creating a new world of its own. They believe that through unity and unwavering effort, the underground city's social civilization will usher in an even more glorious future.