Yongsaui Ballad

Only the purest of souls may shine as a star, the brightest of which is inevitably the most destructive of them all. The demon and the hero are but two sides of the same blade. A hundred years after his death, the fallen swordmaster of the empire returns as young Ricardt and sets out on a journey to uncover the truth behind the war that consumed his first life.

(Source: WEBTOON)