Isekai’d as a side character

I possessed of the Empress in the novel of Rofan. The problem is that the Empress is a supporting character who will be pushed off the throne by the cunning Emperor, then eventually dies of illness. I don’t want to die cold and alone, waiting for my love to come true, like the original empress. So I'll be the villain and get a divorce.
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I reincarnated into my own, incomplete novel before I wrote about the beauty’s appearance. All I know about the “Beauty” is that she has black hair and crimson eyes, but after witnessing Prince Reynsis’ unfortunate childhood firsthand, I resolved to go and find the Beast’s Beauty myself.
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Lilian McEllion, the girl who wanted to avoid a bad end, willingly went to the insomniac emperor in place of her sister, Leilan.
She is tasked to help the sleepless emperor, who was cursed by a witch, by using her ability to induce sleep whenever she touches another person's body with her lips.
Can Lilian survive being with the emperor?
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• TW: suicide

After dying in an accident, I was reincarnated in an otome game… as a crow. Not an extra, but a crow! When I was looking for a person around me, the first who appeared was the Crown Prince.
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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, her normal everyday life comes to an end.
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• I’m including this despite her not transmigrating into an existing story because it’s in a story-like world

Nara Lee ends up reincarnated as the 8-year-old Sharon Atrina, a side character in her favorite webnovel, “The Queen's Extravagant Outing.” As Sharon, a wealthy and beautiful noblewoman, she has everything she could possibly want, but she’s destined to die a pitiful death at the age of 20 after being betrayed by her best friend, Carol—the villainess.
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