Trying to find this manwha

Trying to find this manwha that has a really pretty art style. Anyway, the crown prince and the commoner woman??? Are a trashy couple and the main lead takes revenge by marrying a prince/emperor of another country. Well anyway during a marriage ??ceremony??? Is when the trasy crown prince descides to pick the other woman but because the main charcter transmigrated she prevents the deatg of herself and the humilation of being rejected in the beginning of the story