Transmigrated as the Sickly Villain's Archrival

Chen Bufan never imagined he would transmigrate into the novel he'd just finished writing, much less become the elder sister of Li Yunzhi, the second prince who had just ascended the throne as emperor and the archenemy of the villain who dies as soon as he appears. She is Li Qianran, the most honored princess of Great Li. Before she can even think about helping the young emperor secure his throne, defeating the novel's villain, and standing atop the world, Chen Bufan's only priority is figuring out how to survive by any means necessary... including shamelessly clinging to powerful allies.