MTL - I Became the Cannon Fodder In the Novels of Female Cultivators - Chapter 18 you have to follow

Arnold never thought his gaming skills would land him in a romance novel—as a doomed side character, no less. To survive, he hijacks the heroine's “system,” bending the story to his will. But when he dodges a deadly duel, he catches the eye of the heroine, Lara, his own step sister—and her love is a dangerous game. Arnold must outwit the plot and his step sister who's not afraid to kill for love. In this LitRPG romance gone wrong, survival isn't just about beating the system—it's about escaping the heart of a yandere.

At Elysia's first meeting with the crown prince, her future fiance ended up punching him. In this way, she violated her first law of survival.

Elysia's three rules of survival - First, Stay away from the main couple of Adam and Eve and make sure they end up together. Second, never fall in love with anyone and keep yourself safe. Third, no matter what happens, make sure you are never caught in any act. Only then will Elysia be able to survive past her death on her 18th birthday.

Ever since her birth, Elysia Raffle knew a few secrets of this world. First, the world she had been born in was a book and Elysia was the villainess in that book. She was destined to be slain by Adam on her 18th birthday and the day of their marriage.

Elysia needed to keep a distance from the main couple to avoid that fate. But how did she do it when she was engaged with one of the main parties and the other refused to leave her alone?

Now Elysia needed to do everything possible in her power to ensure that her engagement with the crown prince was broken and the main couple ends up together.

But it was easier said than done.

Ruel finds himself thrust into a brutal post-apocalyptic world, bound to a bizarre “Milf System.” This system demands morally questionable acts – NTR, seducing milfs, and claiming other men's wives – as the sole means of gaining strength and essential survival skills.The brutal reality of this new world awakens Ruel's hidden lust and dark desires. He swiftly abandons any semblance of morality, embracing the system's perverse demands with growing fervor.Driven by an insatiable hunger for power and pleasure, Ruel revels in the ravages he inflicts, using his newfound abilities to dominate and conquer.His journey transforms him into a ruthless force, where survival is intertwined with the satisfaction of his darkest urges, leaving a trail of broken relationships and conquered women in his wake.

She was the godly thief of the 24th century, yet she was reincarnated as a good-for-nothing idiot with no parents. Not only that, she had to bend her will according to her relatives’ mood. Idiot? Trash? Very well, sooner or later, she will show these group of silly earthlings what it means to be too late for regrets!

Battle-qi? Magic? Her talent on both magic and martial arts will mortify every genius in existence. The position of the clan chief? The mythological Vermilion Bird? Want them? So sorry~ She already took them!

But who will tell her, that the cute boy who gets carsick easily was really the mythological Vermilion Bird? Then, what about the elder that’s residing in her body, just which deity does that mysterious soul belong to? Furthermore……

Why was it that other people’s companion were those kind of domineering, and incomparably mighty type. Why was it the ones around her were either an evil merchant or a sly fox, a useless nerd or a playboy, the worst is this sick pretty boy! What happened to ruling the world, and standing above all else? Please don’t f*ck with me!

- Description from novelupdates