In a world full of dungeons, Sung Joon was confessed to be useless in the community for bad remedy skills. Though he got C-rank, he couldn’t overbeat anyone with E-rank. Healing just wasn’t for him. His boring life completely changed when he wandered along with a dungeon and found a sword. As it was stuck, members of Sung’s team tried to pull it away but failed. Joon decided to try his luck but when he made a step forwards, a new challenge appeared. A taken sword made Joon realise that his current life was nothing compared to his vocation. The story retells about a loser who transforms into the most powerful master of Sword.