The Margrave's 10th-Class Outcast

Isaac von Goethe's uncontrollable mana explosions have harmed everyone around him, forcing him into 60 years of isolation. However, Isaac is given a second chance when he is suddenly sent back in time to when he was 12 years old. With the knowledge of his older self and his rapidly growing powers, Isaac sets out to protect his family estate and its people from monstrous creatures, corrupt forces, and the greatest threat of all: himself.

(Source: Webtoon Entertainment)