Han Sung was once summoned to another world, where he spent his entire life as an SSS-class monster hunter serving the empire. After enduring countless battles and hardships, he ultimately lost his life—only to be reborn as Dale, the first-born son of the Jackson Duchy.

In this new existence, he is revealed to be the heir of the Black Duke, a feared figure and the greatest dark magician on the continent, as well as the leader of the Dark Tower. Carrying memories of his past life, Dale awakens with a single conviction: to bring destruction upon the empire with his own hands.

Armed with knowledge of swords, magic, and strategic warfare from his previous life, he rises as a once-in-a-generation genius within the duchy. His journey begins without hesitation, and the limits of his potential remain unknown as his new destiny unfolds.