I Transmigrated After My Half-Sister Stole My Marriage Match, but My Frail Husband Dotes on Me

[Transmigration + Married First, Love Later + Sweet Romance + Devoted to Each Other] Xia Yu transmigrates into the eldest daughter of an earl's household. Unfortunately, her birth mother died, her father remarried, and her stepmother raised her to be a pushover. Her younger half-sister is supposed to marry a sickly man, while Xia Yu is set to marry his handsome younger brother. Unwilling to let her own daughter spend her life as a widow, the stepmother schemes to switch the brides. The original Xia Yu resists and grows so distressed that she falls ill with a cold. Unexpectedly, that's when the new Xia Yu transmigrates into her body. After transmigrating, the heroine says she only wants to be a cold-hearted villain, but the System won't let her. Whenever she does something bad, it burns her, forcing her to become a paragon of truth, goodness, and beauty. Xia Yu sneers. “I can take the roundabout route to victory.” She adds retinoic acid to a face cream for her sister to use. It's a great product, after all. What? It ruined her complexion? Then she can only blame herself for not knowing how to use it. She gives the bad guys some modified muscle-relaxing water. That's doing a good deed, right? What? That person later turned into a woman? How would I know? Maybe the potion has side effects! As for her husband, Mo Xian, he looks so hopeless that she might as well save his life. Watching Xia Yu leave, Mo Xian tells the shopkeeper, “Raise the prices by ten percent whenever she comes to buy something.”