For Better or For Worse
Girl realises that her current life is that of a girl in a book she read in her previous life. In the original book, her younger sister marries a duke-to-be only to later die during childbirth. Knowing this, the older sister takes her place in marrying the "duke", though she finds this difficult as she doesn't yet love him.
Aidin
FL is the leader of a small group of assassins under the emperor's command, but she is also the rightful heir to the throne. The emperor orders her execution, and she reverts back to her younger self upon her death. She finds out that the emperor ordered her father killed and the "anti-imperialists" she has been ordered to kill over several years were followers of her father's. She is sent to a neighbouring country under the guise of a hostage while a peace treaty is drawn up, but the emperor truly sent her there to assassinate certain nobles. Instead she defects, and is working with the crown Prince of said neighbouring country to take down the emperor of her own.
I Don't Trust My Twin Sister
Girl's fiance runs cheats on her w her twin sister. She reincarnates and forms a contract marriage with the grand duke, instead.
Sickly? Husband's Contractual Wife
Girl is sold off to a duke but reincarnates after she is executed when accused of poisoning the duke. He's quite sickly, so she in her reincarnated life nurses him back to health. His maid is sus and the head maid even more so
The Lady Wants to Rest
Girl has reincarnated hundreds of times and is bored. She just wants to rest. Her current reincarnation is a p rincess, and she has the typical horrible step-mother
Anyone Beats the Original
Girl isekais into novel as wife of "dark duke" who poisons her. She attempts to break her engagement with the duke, but fails.
I Gave Birth to the Tyrant's Child
Pretty good. Knight spends one knight stand with emperor, but in a wig. When she returns back to work, she is unrecognised by him. She turns out to be pregnant w his child, and she attempts to hide her pregnancy. Meanwhile, the emperor for some reason is also experiencing symptoms of nausea as the FL is. I wish the captain would bugger off
I’m Only a Stepmother, But My Daughter is Just So Cute!
30 yo isekais into snow white's mum, treats snow white lovingly and gives the dad the cold shoulder
Royal Cinderella Mama - I Was Reincarnated as a Poverty-Stricken Woman but an Emperor Became Infatuated with Me!?
Girl isekais into poor baroness, the emperor takes an interest in her and courts her.
The Golden Haired Elementalist