This is a world that is highly modernized and technologically advanced on the surface, but yet hides ancient mysterious power in its undercurrents. Under the steel and concrete of the bustling city, there are countless forgotten ruins, secret realms, and fragments of ancient civilizations that are closely related to the origin of the world, the "Core of the World." High technology is intertwined with alchemy and the power of runes. There are both future technologies controlled by chaebol giants and ancient secrets guarded by reclusive families for generations. Human civilization is struggling on the edge of "great annihilation" time and time again. It not only enjoys the convenience brought by technology, but is also subject to incomprehensible supernatural phenomena and threats from other spaces. Some areas have become wasteland due to disasters or energy leaks and have become restricted areas.
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