10 years ago, after "The Gate" that connected the real world to the world of monsters was opened, some of the people were given the power to hunt down the monsters that lived on the other side of it. They are known as "hunters". However, not all hunters are powerful. Sung Jin-Woo, an E rank hunter, is someone who has to risk his life in humble dungeons, they call him the "weakest in the world". Having no skills to display, he barely makes any money fighting low-level dungeons ... At least until he came across a hidden dungeon during a raid. After being on the brink of death, Sung Jin-Woo has a " Second Awakening "and with this he gets an invaluable power.