In the mobile gacha game infamous for its atrocious difficulty, ,the Master ranked 5th in the world, ‘Loki’, loses consciousness while raiding the Dungeon. After waking up, ‘Loki’ realizes he has turned into a Level 1, 1-Star Hero—’Han Yslat’. To return to Earth, he must lead the newbie Master and heroes and clear the 100th floor of the Dungeon! ‘You messed with the wrong guy.’ This is the story of hard carrying by Master Loki who never accepts even a single defeat.