Which novels told the story of a killer who traveled to ancient times and became a child?

There were two novels that met the requirements. They were "Rebirth: The Reborn Concubine at Thirteen Years Old" and "The Killer Concubine at Thirteen Years Old." The plots of the two novels were roughly similar. The female protagonists were both killers who were reborn as ancient girls. Among them,"Rebirth: The Reversal Emperor's Concubine at Thirteen Years Old" was a female dynasty novel, while "The Killer Crazy Concubine at Thirteen Years Old" was a transmigration novel. I suggest that you take a look at the two novels and see which one suits your taste better. I hope you like my recommendation. Muah ~