After Exchanging Marriages with My Eldest Sister, I Became the Mistress of the Palace

Jiang Qingyu and her cousin Jiang Qinglian were reborn together. In their previous life, the two sisters became wedding brides on the same day. She married Song Yi, the son of a Beijing merchant, who had been in a coma for three months on behalf of her cousin, while her cousin was carried into Prince Han's palace to marry the sick son of Yangzi as a side concubine. However, her wedding was successful, and Song Yi woke up that night. From then on, the Song family regarded her as a lucky star, her husband doted on her, her parents-in-law liked her, and even the sisters-in-law in the house rushed to please her. Later, the Song family gained the attention of the emperor and became the first imperial merchant in the Sui Dynasty and the richest man in the world. Song Yi was even named a general, and she followed her to wealth and glory. However, when the cousin entered Prince Han's Mansion, Prince Han's condition worsened, and a group of black cats barked at night. Everyone in the palace said that she was a disaster star, which made the old princess unhappy. The prince and princess also criticized her many times. The days that followed were even more miserable. In the end, her innocence was stained by a servant, and she died under Prince Han's sword. Seeing her cousin eager to "return to their respective places", Jiang Qingyu remained calm. It didn't matter who she married, but who she married was the most important. How could she, a reborn time-travelling girl, not be able to handle the people in Prince Han's Mansion? What her cousin didn't know was that every member of the Song family was a cannibal. The Song family's future brilliant achievements were only made possible by Jiang Qingyu's advice. Without her as a "lucky star" in this life, could the Song family survive? ! As for her days in Prince Han's Mansion after her marriage, it can only be said that she was born with unstoppable luck and cheated on her way to prosperity. She became the treasure in the palm of the yandere prince, and no one could bully, beat or scold her...