Transmigrated into the body of a villain, I became my sister's savior.

(Single female lead + urban + sweet romance + happy ending) Lin Jianshen transmigrated and his soul was transmigrated into the body of a scumbag who abused his adopted sister.
Seeing the girl covered in wounds, he decided that he would bear the infamy, but he had to save her.
He brought countless characters to life in short dramas, yet he grew increasingly flustered under her ever-growing dependence on him.
He thought he had fooled her, but to his surprise, she threw herself into his arms: "I know you're not him."
"Please... never leave me."