I Came Back for You (English-dubbed)

Ryan Carter was a billionaire—until he woke up as a high school nobody. Everyone still sees him as the clumsy kid crushing on the class queen, Olivia. But Ryan doesn't care about old reputations. He has one goal this time: save Grace Sinclair, the girl he lost to a fatal disease in his past life. While building a fortune, he'll rewrite the future, protect her at all costs, and finally win the love that slipped away. This life, he's playing for keeps.