Transmigrated as the Villainous Fake Girlfriend of a Mad Prince

[Real and fake heiresses + Sweet romance + Everyone's favorite + Marriage before love + Early chapters in a rented apartment + Return to the past] Sheng Xingsheng transmigrated into a book, becoming its villainous supporting character. In the original story, the real heiress was switched at birth and didn't discover that she was born into a wealthy family until she was eighteen. She abandoned her adoptive parents and immediately returned to her rich biological family. Not only did she target the fake heiress at every turn, she also stopped at nothing to steal the fake heiress's fiancé. After the real heiress hurt the male lead's family, he found out. To escape responsibility, she hit him and gave him amnesia, then lied that she was his girlfriend. She ended up keeping him by her side and deceiving him for three years. A year after Sheng Xingsheng arrived, the fake heiress would find the male lead and help him recover his memories. As for Sheng Xingsheng, her ending would be to be kidnapped by the male lead, left in a field of a hundred landmines, and blown into scattered dust... Thinking about this ending made Sheng Xingsheng break out in a cold sweat. So she continued acting up like the original character, hoping to engineer a successful breakup. But the male lead had already been turned into a hopeless romantic by the original character's lies and refused to end things. Sheng Xingsheng had no choice but to accept the situation. In that case, she might as well make the best of it and live a good life...