After I Transmigrated into a Book, the Villainess Was Sweet and Sassy

Bai Ruochen, a brilliant scholar with both beauty and brains, transmigrated through a book into the body of the marquis's fifth daughter, a concubine-born young lady. The original girl was dull, fierce, and lowborn, a pariah with a tragic ending. Bai Ruochen sighed and rubbed her forehead. Can't a supporting female character stray from the script? I want a life that's bold, thrilling, and free! But somehow, she accidentally changed the female lead's fortunes. I really didn't mean to~