Reincarnated

I just want to live a normal life, why is this happening to me!” Your average student Ham Dan, whose hobby was reading “Law of Insomnia” wakes up to a beautiful novel like heroine. But even in the world of fantasy novels, her role is no different. Stuck as the childhood friend of the heroine, her normal everyday life comes to an end, becoming more twisted by her strong character.
It’s really confusing sometimes but the plot is ~sublime~. The ending is a bit sad

When I opened my eyes I had become a princess! But out of all characters in this romance novel, why is it the princess who has the fate of dying to her own blood-related dad, the emperor! If I want to live, I must not be seen by that emperor dad.
“When did this kind of scumbag start living in my castle?”
The man who doesn’t have single drop of blood nor tear to drop, that cold emperor Claude! Will Atanasia who had been caught by the emperor be able to survive?
ONE OF MY 4EVER FAVS

So mc regain her memory from past, realize she is a villainess illegitimate daughter who will be killed someday due to the heroine. Her power is not the same as her family as in the story she is really not part of them and has no blood relationship. Nicee kaayooo trying to break engagement with prince ad earning money as 3 years heroine will be adopted by her fam.

She's ah used by her father, dies when he was oven blows up, possessed the body of the villainess in her favorite story book, who abuses her own son and eventually gets executed by him. She's trying to redeem herself. Offers a contract marriage to her son’s godfather.