Looking for an Ancient Female-Dominance Novel, Super Sweet 1V1

I think it was a quick-transmigration story. In one ancient setting, the female lead was a prince or crown princess who was granted a marriage to the second male lead. He looked down on her, then drugged her and locked her in a room with the male lead. Later, she changed and lived happily with the male lead, even building him a school. The male lead called her his wife.