Please recommend a time-travel novel. The female protagonist was originally a young lady who was abandoned in the countryside, and the male protagonist was a prince.

The plot was that the female protagonist was originally a young lady and was abandoned in the countryside. The male protagonist was a prince. After an accident, the female protagonist saved the male protagonist in the land. Later, the male protagonist fell in love with the female protagonist and went home to ask for an imperial edict. He married the female protagonist. Oh right, the female protagonist also had a twin sister. The younger sister liked the male lead very much. That was probably the plot.