Cheng He Titong

Beautiful, tragically ill, psychotic tyrant × Seductive, clever corporate drone turned royal consort.
The modern corporate worker Wang Cuihua unexpectedly finds herself in a novel about transmigration, becoming the disastrous beauty Yu Wanyin in the story, and allies with the tyrant Xiahou Dan, who is also a transmigrator. The two engage in a battle of wits and courage against various forces, ultimately joining hands to change the tyranny and develop feelings over time. However, as the hidden truths gradually come to light, Yu Wanyin realizes that her arrival is actually a lifeline for saving Xiahou Dan...
(Source: Kuaikan, translated)