Oh No! The Villainess Has Wanted to Change Her Villain Persona for Ages

No requests for recommendations. After Xiao Yanfei transmigrates into a book, she figures her identity can’t be simple. The signs are: 1. She’s a concubine-born daughter of a marquis, but stunningly beautiful. 2. Her legitimate elder sister is the heroine and is discussing marriage with the emperor’s eldest son. 3. She’s on good terms with a young lord who has every villainous advantage stacked in his favor. By the laws of transmigration, she must be an extremely important… villain. And at the crucial moment, she’ll sacrifice her intelligence, dignity, and… life for the hero and heroine’s epic love story. At first, Xiao Yanfei only wants to keep a low profile, avoid sacrificing her life, and escape the worst possible ending. Later, she discovers that the original owner was switched at birth. From then on, she and the heroine were assigned opposite legitimate and concubine-born identities. The original owner even believed the real culprit was her birth mother and, under her aunt’s “earnest guidance,” willingly risked everything for the heroine. Meanwhile, the reborn heroine takes the original owner’s identity, treads on her blood and tears, and stages an “epic love story” with the emperor’s eldest son: “The pampered wife runs away pregnant, and he chases her to the ends of the earth!” Xiao Yanfei: … I’m tired. She rolls up her sleeves and gets ready to sharpen her knife, determined to tear up the ridiculous plot and set things right! The young lord with every villainous advantage stacked in his favor: Need a hand? Xiao Yanfei: Sure. * Gu Feichi, heir to the Duke of Weiguo, is rebellious and unruly. He pacifies the Western Rong and subdues the Northern Di. His army is invincible wherever it goes, winning thousands of miles of territory for the Great Jing dynasty. With a ghost mask covering half his face and his scarlet robes fluttering in the wind, he reaches out to her amid thousands of troops: “From now on…” “Those who obey you will prosper; those who defy you will perish!” Note: The setting is entirely fictional. Please don’t nitpick the historical details. No writing advice, please. Theme: Everyone is the protagonist of their own life!