Unlimited Upgrades Starting from the Dungeon

The underground city, this mysterious maze buried deep in the earth, carries the dreams and ambitions of countless adventurers. According to legend, it can grant anyone's wish - wealth, power, immortality, and even the resurrection of the dead. However, the dungeon never gives out, it only conducts transactions, and the cost is often beyond imagination. ———— Kailan died on the thirteenth floor. As an adventurer, he goes deep into the dangerous underground for one purpose: to obtain a rare healing potion that can save his sister's life. However, fate cruelly took away his life, leaving only unfinished mission and endless regrets. But death is not the end. A soul from another world traveled through time and possessed Kailan's broken body. The new Kailan inherits the abilities, mission, and determination to save his sister from his predecessor. But he soon discovered that his predecessor's death was no accident - there was an unknown conspiracy hidden behind it. Starting from the thirteenth floor, Kailan embarked on the road back to the surface, and this was a road full of blood and betrayal. He encounters vicious monsters, greedy companions, and adventurers who fall for lust. Each level is a new trial, and every battle is a life or death decision. "In this eternal maze, everyone is looking for something. The question is, when you find it, are you still the same person?"