Duke's Eldest Son is a Regressed Hero

Synopsis

Once celebrated as the hero who vanquished the Demon Lord, Aden Albireo is betrayed by his closest allies and meets an untimely death. Unexpectedly, he awakens fifteen years prior to the Demon Lord's resurrection, inhabiting the body of Aden Remes, the previously unremarkable eldest son of a noble house. Determined to alter the course of history, Aden leverages his future knowledge to prepare for the impending threat. However, his mission becomes more complex when he discovers that the Demon Lord's essence resides within him, leading to an uneasy coexistence. As he navigates noble politics and looming dangers, Aden must reconcile with his inner adversary to prevent the world's descent into chaos once more.