Matabui Munjeadeul

Once the greatest mage and Grand Magus of the White Tower, Oscar Sage dies in a war against The Demon Emperor—only to awaken twenty years later as the disgraced noble, Oscar Crusian. The once-mighty White Tower lies in ruins, and rival factions hold control over military and resources. With his mana circuits sealed and former allies now enemies, Oscar must rebuild the White Tower, seek vengeance, and reclaim his power before the Mage Council exiles him for good. Will magic rise again or will it be buried forever?

(Source: WEBTOON)