Man, that title got me curious too! I read the first season a while back. The main hook is this guy, Kang Yoo-sik, who's the final boss of a popular novel's world—basically a terrifying villain. Then he gets hit by a truck and wakes up back in time as a kid, with all his future memories. The plot is him trying to change his fate, like avoiding the 'bad ending' where the protagonist and a group of heroes take him down. It's not just about gaining power; a lot of it is psychological. He has to navigate the original story's plot while pretending to be a normal noble heir, all while dealing with the knowledge of his past crimes and the people he'll eventually hurt. Kinda heavy for a manhwa, but the art's fantastic. The tension comes from whether his efforts to be 'good' will even work, or if he's doomed to become that monster again.
His relationships with the future heroes, especially the protagonist Selena, are super messy and layered. He knows how they'll develop and tries to manipulate events, but it backfires in human ways that feel authentic. Honestly, the power fantasy is there, but the guilt and the creeping dread of inevitability are what I remember most.