A parallel world where modern cities and hidden fantasy coexist. On the surface, it is a technological civilization, but in fact it hides the power of "ancient veins". Major families and hidden sects control supernatural powers and secret techniques, and use "source power" as the basis to divide the nine realms. Under the city, there is a "ruin realm" traveling through it. Ancient ruins and secret trials are hidden in the cracks of reality such as the last subway train, late-night elevators, and abandoned hospitals. Only those with special physiques or opportunities can trigger them.
