The Villainess Will Bring Down the Marquis's House!

An ordinary college student is pulled into a manga world and wakes as a marquis’s daughter engaged to a prince. Cast as the villainess, she learns the match exists only because the prince fears her father’s power; when that power falls, he breaks the engagement and ruins her family. Knowing the story’s route, she works to change the ending by persuading her father and planning to stop the house from collapsing.