[Transmigrate into a book + historical era + wish fulfillment + sweet romance and raising kids]
Xu Man, a lifelong singleton, accidentally transmigrates into a book and becomes the textbook villainess.
Then the entire book is rewritten by its original author, and she goes from being cast as the villainess to the heroine, while her husband is upgraded to the new male lead.
Xu Man plans to fake her death and escape, but the author violently pries the lid off her coffin: You're the heroine now. How can the rest of the plot continue if you die?
Xu Man: ??? Can't I go home?
Author: No, sweetheart. You have to finish the main plot before you can go back.
Xu Man: What if I don't?
Author: Director He is the most perfect character I've ever written. Can you really bear to leave him?
Xu Man: Shameless! You're seducing me!
Author: Insult me, will you? I hope you have ten sons with Director He in one go!