My System Isn't Activated?

A billionaire at the end of his life, drowning in regrets despite his fortune—missed love, neglected family, a youth squandered chasing success. Then fate grants him the impossible: a second chance. He wakes up in his second year of high school, the classroom fan spinning lazily overhead, the future unwritten. Armed with decades of hard-won wisdom and the memory of every mistake, he's determined to rewrite his story. This time, he'll ace his studies, protect his family, and wait for the girl who'll haunt his dreams. But there's one problem: the mysterious system that should guide him... won't…