Mistaken Flirtation: The Fourth Lord’s Beloved

In a single night, Shi Yuan's whole world changes. She never imagined she was the fake heiress, switched at birth into the Jiang family of Yuncheng. So what if she's not their biological daughter? The bond of upbringing outweighs the bond of blood, and she intends to keep being a good daughter to her parents. But the seemingly meek and harmless real heiress quietly steals her fiance, while her kindly adoptive parents turn out to have their own designs on her. Shi Yuan runs for her life and accidentally crashes into a powerful big shot. Wait, isn't Lu Tingzhi the older brother of her scumbag fiance? Thinking of the real heiress's smug face, Shi Yuan grits her teeth. She has to get revenge. She clings to the big shot, and in a flash, Shi Yuan becomes the scumbag's sister-in-law. But this Lu Tingzhi isn't that Lu Tingzhi. Uh, what do you do when you accidentally marry the wrong brother? Asking online, and it's pretty urgent...