Isekai'd as a side character

Jinsoo Lee has played this game before and knows enough about it to realize he’s been transmigrated as a villain who dies way too soon. His new plan is to lead a quiet life while he figures out a way back to his world. But for some reason, things aren’t going the way he planned. Can Jinsoo find his way back from his sister’s dating sim?
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○ : violence against a child; sexual assault

After getting struck by lightning, she finds herself in the body of Sisha Arvina, a character briefly mentioned in the novel “The Emperor Doesn’t Pick On Flowers” who kills herself early on after being rejected by the deuteragonist, Iape. But it turns out that the novel’s description of events revolving around poor Sisha are not truly what transpired…
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Waking up, Kim Hajin finds himself in a familiar world but an unfamiliar body. A world he created himself and a story he wrote yet never finished. He had become an extra with no importance to the story whatsoever. The only clue to escaping is to stay close to the main storyline. However, he soon finds out that the world isn’t exactly identical to his creation.
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The Crown Prince was cursed to swap bodies with the women he slept with, and I became the daughter of the Duke’s family who was punished for not being able to lift his curse. In order to break it, I seduced the cold and indifferent prince to spend the night with him. While I was in his body, I consumed a magic potion that would dispel the curse but soon forgot about him, but…
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Tattooist food–lover Yoojeong awakens in a novel she read as a woman named Sylvia. In addition, she happens to meet Felix the hero of the novel, who suffers from anorexia and will soon turn the continent into blood. In order to cook more easily and eat more delicious food, Sylvia inscribes magic circles onto her body. The new magic circles that are born through her fingertips bring a new breeze to the continent where magic-beasts are rampant.
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: abuse

I’ve possessed the body of Eleanor Maurice, a widowed baroness in a novel with a mere four lines of dialogue.
After pouring in my blood sweat and tears, I’ve finally been able to achieve a respectable position within this society, and now I’ve been offered a sweet deal.
If I’m able to introduce the male lead to the female lead and help the original plot come true, you’re telling me a huge sum of money will be within my reach?
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I was reincarnated into an otoge I had played in my previous life.
The beautiful Ophelia is loved by numerous nobles while Emilia, the character I reincarnated as, has a supporting role of a minor villain who follows around the male leads after Ophelia’s death, only to be destroyed by them. So I decided to quietly leave the place I had lived for ten years on the day of Ophelia’s funeral.
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○ : abuse; suicidal imagery

The duke kidnapped her, but little does he know, this is all according to her plan. Diana lets herself get kidnapped by a bloodthirsty duke from an enemy empire to avoid a certain death that will reduce her character's significance to nothing. But he's also not as ignorant as Diana thinks. How far is she willing to go to keep this storyline where she wants it?
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○ : abuse; kidnapping

Transmigrated into a tragic novel as the female lead’s best friend, Kim Heesoo must get as far away from Claudia Chamberlain as possible if she wants to live. But how could she possibly let down such a sweet girl?
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