Five years have passed since the world faced a dungeon break, resulting in the emergence of various creatures and countless lives lost due to unforeseen events. And people awakened special abilities and became a Hunter. Suddenly, a massive black dungeon appeared, releasing the strongest entity and triggering a status window for everyone, revealing it as a Danger level dungeon. As despair swept through humanity, but group of brave hunters rose to confront and defeat the boss dungeon.From that moment on, those who vanquished the boss dungeon were forever known as the "Unknown Heroes”. Since that day, the unknown heroes they knew suddenly vanished without a trace.
