Mo-Ah Son unexpectedly stumbled into a dungeon and became an item-collecting hunter. Though she narrowly escaped death, she yearned for a quieter life. However, fate intervened and trapped her in another dungeon. When Ji-Han Seo, the most skilled survivor, appeared to save her in a crucial moment, she was shocked. Even though their history was complicated, she was astonished by his plea for her to pledge to defeat every dungeon boss across the globe.