The protagonist is a young man who continues writing unpopular web novels to support his mother. However, one day, after mysteriously signing a contract, he is reborn into the world of his own novel “Overlord Hero Chronicles”—not as the protagonist, but as a side character named Attila. Struggling to survive in the harsh otherworld, Attila fights alongside his father Munzuk, the tribal chief, participating in inter-tribal conflicts and rising to prominence through numerous battles. Attila embarks on a journey to find clues to return to the original world. While following the original story, he leads a mercenary group through fierce battles and achieves victory. Finally, he confronts the original protagonist “Charles” and achieves victory, becoming famous. However, this influence causes the history within the novel to gradually distort… Can Attila return to the original world? And where does the grand story he walks lead?! This is a 100% satisfying otherworld battle fantasy depicting growth with companions and intense battles against destiny!​