In 4160, cracks in the caves tore the earth apart, spiritual energy revived, and alien beasts ran rampant. Humanity rebuilt civilization on the ruins and entered the "Era of High Martial Arts."
The sixth floor of the underground city, the slums.
Chen Yuan, eighteen years old, is the cheapest handyman at Iron Bone Martial Arts School. After ten years of training, he was not even qualified as a warrior, and everyone called him a waste, until the night when the cracks in the underground cave exploded in the slums - he carried his best friends on his back and fought out of the group of alien beasts. When he was about to die, a nine-story ancient bronze tower lit up in the sea of consciousness.
