Mark of the Fool

Alex has one goal in life: attend the greatest magic university and become a powerful wizard. But just as his dreams are about to come true, he is branded as one of his kingdom's Five Legendary Heroes. And, as fate would have it, he's the one destined to die. Burdened by the Mark of the Fool, Alex's magic no longer works as it once did. The Mark interferes directly with the power he's spent every free moment studying. But he’s not about to let that take his future away. There’s a loophole to every rule in life and magic -- even the ones written by a god. Alex is going to become a master wizard, and not even fate can stop him.

Source: Webtoon