Looking for a manhwa!

HELPP

Im looking for a manhwa I lost a while ago and just remembered. It was different and had a good/interesting start. The fl has powers and turns back time but in this new life her powers transfer to her sister and instead of her saving the duke like her last life her sisters saves him instead. I think fl has brown and ml black hair while her sister is blonde( not too sure) anyways this all happens in the first few chapters and I got hooked immediately but lost the story. PLEASE LET ME KNOW IF U KNOW WHAT IM TALMING ABOUT!