Weird games have come to reality, and the world has become digitized. Human beings are forced into the dungeon, and they can only survive by clearing the level. In this world, ghosts kill people, and "underworld coins" are the only hard currency that can buy ghosts' favorability, immunity, and even enslave ghosts.
Ordinary people are struggling to survive in the dungeon and cannot even afford a piece of moldy bread; while the protagonist holds trillions of ghost coins and becomes the only "god" in the strange world.
Jiang Liu, an ordinary social beast, accidentally awakened the "underworld god system". His Underworld Coin balance was followed by a string of countless zeros, but he discovered that the money was just waste paper in the real world and could only be spent in strange copies.
The main focus is "dimensionality reduction attack". When others are kneeling down and begging for mercy, the protagonist is asking the ghost king: "One hundred million, I will buy your life. Do you want to sell it?"