There are a few novels that are about the plot of the female assassin's transmigration. I recommend a few of them to you: "The Black-bellied Female Empress Choosing Her Husband","The Evil King's Favorite Concubine: The Useless Miss Defies the Heavens","The Assassin Reborn: The Little Consort Defies the Heavens","The Reborn Poisonous Woman Can't Be Trifled With", and "The Female Assassin Transmigrated into a Money-losing Item: The Perfume Consort". I hope you will like my recommendation. Muah ~