The Legend of the Shining Sword

Eun-Ho, the strongest being in the spirit realm, descended into an empty life of relentless slaughter when he tragically lost the mortal woman he loved. Seeking redemption and a chance to live as a human, he repents for a thousand years and willingly sacrifices the core of his power in order to be reincarnated. But when he is finally reborn, he’s shocked to find himself in the body of a frail young boy. Now, the former king must navigate his new life as a powerless human and master martial arts, the very practice mortals once used against him.(Source: Tappytoon)