One Oath for a Thousand Calamities

This is about a girl and a young man; The girl is not an ordinary girl, and the young master is not an ordinary young master; This young man made an oath to a man for another girl, and because of this oath, he chose to forget the girl. This stubborn girl decided to fight him to the end, and finally one day she squeezed out everyone else in his heart and firmly occupied the first place...