The female lead is transported into a noble's body and becomes friends with a boy (bastard prince). She dies for him after he executed his father for the crown and then wakes up again as a young girl because prince turns back time with his powers.
Random things I remember: The dad dies in a carriage accident... Two twin cousins who are friends w/ them to, one becomes a priest and the other a soldier... They all made a time capsule, and she dug it up early... She sacrificed herself cause she thought it would end the story or something... "It's over now" or something haunted male lead
I swear I'm not crazy but I can't find it anywhere!