The Book’s Heroine Arrived and Found the Entire Plot in Shambles

[Everyday face-slapping and gossip + sweet romance + one-on-one] Content warning: The heroine is not a good person. Read with caution if that's not your thing. A gossip-loving heroine who seems sickly and easy to bully but is actually wicked inside VS a male lead who seems like a spoiled wastrel but is secretly an arrogant, lovesick puppy. After a serious illness, Jiang Wei wakes up and discovers she's a doomed supporting character in a transmigration novel. The heroine is her full sister, Jiang Yun, who shares the same father but has a different mother. In the book, Jiang Yun comes from another world and transmigrates into the body of a vicious supporting character with the same name. From then on, she goes around face-slapping people and taking down scumbags, while meeting handsome men left and right. As for Jiang Wei, she's just an insignificant passerby, a cannon-fodder character in the book. Still unsure whether to believe it all, Jiang Wei heads straight to the front lines of the face-slapping scenes to investigate and enjoy the gossip. After witnessing one spectacular scene after another, Jiang Wei has to admit that watching the drama unfold right in front of her is truly satisfying. From then on, she spends her days watching the drama firsthand, occasionally changing the plot to see what happens next. The only thing that bothers her is that, because she keeps showing up wherever the gossip is, her heroine sister seems to have gotten the wrong idea. She keeps testing Jiang Wei from time to time. But what can she do? She loves gossip. She'll just have to put up with this little annoyance. After every attempt to test Jiang Wei backfires, and every scheme leaves Jiang Yun worse off than before, she belatedly realizes that the plot has long since strayed from the original story and is heading in an unknown direction. And her sickly, legitimate older sister, who was supposed to die young, is not only alive and well, but has also married the capital's number-one wastrel and become a titled noblewoman?!