Rebirth from Hell

In the future world, the surface of the earth is an industrial ruin, with a technologically dazzling sky city suspended in the sky, and a nine-level hell-like mining area below. The miners have no names, only numbers. They rely on mining "star crystals" to support the upper class, and their right to survival is firmly controlled. The protagonist numbered F-25259 and his friend F-24342 live together in a dormitory in the mining area. They repeat the numb life of going down the mine and sorting ore every day. The only hope is to climb to the city in the sky through the cruel "arena". After finally qualifying for the competition, friend F-24342 tried to save the protagonist, but was killed by another companion. The protagonist endured grief and overcame many difficulties, climbed to the third level of the arena, and experienced many bizarre events. In the end, he arrived at the Sky City alone, but unexpectedly uncovered the unknown secrets hidden under its prosperous appearance.