This is a highly involved cyber urban world where the entire population is in debt. A hundred years ago, "Xuyuan" came and monsters were rampant. In order to protect themselves, humans signed the "Fire Fire Agreement" with higher-dimensional beings: humans use "life span" as collateral to borrow "extraordinary martial arts power" from higher dimensions.
Today, the world is prosperous on the surface, and force determines wealth and status. But in fact, the entire world is on the verge of serious "forced bankruptcy". All martial arts power comes from "loan", "lifespan (life fire) = force currency = the only legal currency".
