I Transmigrated Into the Heroine's Frail Sister

Xia Le’an transmigrated into a female supporting character who shared her name but used different characters. Being sickly was bad enough, but the heroine, her own older sister, stole her fiancé and even flaunted him in front of her. She couldn’t sit still any longer. She wouldn’t let the heroine torment her like this, so she fought fire with fire. Not only did she drive the heroine to villainy, her own health gradually improved, and she became the darling of the family. She and the male lead stayed happily together for the rest of their lives.