Dumped the Crown Prince, Fell for the Regent

Yvonne Sterling, heiress, betrothed to Crown Prince Hector Hale. Hector abandoned her for Lila Sullivan, the fake heiress. Yvonne took a male consort, Cedric Hale, Prince Regent, who secretly loved and helped her. Hector bullied Yvonne, then tried to win her back. Yvonne chose Cedric. Lila bullied Yvonne, sabotaged her shop. Yvonne grew her shop, became top imperial merchant, crushing Lila, living happily with Cedric.