In a time and space parallel to the real world, humans coexist with dungeons. Dungeons are the entrance to another world, filled with monsters and treasures. Hunters are a group of humans who have awakened special abilities. They enter dungeons to hunt monsters and obtain resources to maintain the balance of the world. However, the rules of dungeons are quietly changing, and a mysterious force is merging multiple dungeons to form more dangerous "double dungeons" or even "multiple dungeons." The protagonist Lin Ye is an ordinary D-level hunter who awakened his dual professional abilities in an accident - he is both a "shadow assassin" and a "guardian of light." He became the only one who can enter...