Jiang Shu is a graduate student in the History Department. When she accidentally travels back in time to the Qi dynasty, she remembers exactly how the history went. She knows that Qi Changning is a famously tyrannical queen, regarded as a villainess in the history books. Jiang Shu was content to play along and act like an obsequious lap-dog in order to survive. However, as she spends more time with the queen, she discovers details hidden from the history books. The "demon queen" doesn't seem to be as bad as what she had read… (Source: Bilibili, translated)

In order to prevent the villainous princess from bringing doom upon this world, Jiang Xu—who transmigrated into her imperial sister-in-law—does her very best to nurture Her Highness into a virtuous and well-behaved ruler, despite her own frail health. However, when she grew up, the haughty yet alluring princess unexpectedly pins Jiang Xu down onto the bed. "If you can love my brother, why not me, too? Won’t you have a look my way, my dear sister-in-law?" Jiang Xu: …If you think I’ve lived long enough and want to drive me mad, just say so! (Source: Bilibili, translated)