The Gloomy Villain’s Little Beauty (Quick Transmigration)

Xin Yi bound the Melodramatic Transmigration System, as a cannon fodder female side character doomed to die early.
She not only has to slap the scumbag in the face, but also capture that shadowy villainous male side character in the Small World who covets the female lead and ultimately forcibly seizes her.
Xin Yi: “……”
So my script role is their sister-in-law, Shiniang, and archenemy’s wife?

【World One: Refined Sister-in-Law × Beautiful Yandere】
Wu Xin Yi is a frail young lady suffering from a heart condition. She married into the Marquis’s residence less than two years ago, yet her husband has already secretly taken a mistress outside.
She had a timid personality and couldn’t compete no matter how she tried, ultimately only able to watch as the concubine enjoyed all the glory and favor, while even her own death from illness went unnoticed by anyone.
This time, Xin Yi—who’s been handed the early death script—decides to take a different path.
She set her sights on the unfavored illegitimate son of the Marquis’s Mansion, currying favor with him and seducing him before he rose to power.

Become the cinnabar mole on his heart that he both loves and hates, dying to tear it apart, devour it, and swallow it whole.
Later, on a stormy night, outside the study.
Her former husband knelt on the ground with his hands bound, blood seeping from his shattered joints and mingling with the drizzling rain.
And just one door away, the villain lightly bit her lips, his eyes reddening with jealousy into flecks of frenzied crimson. “You’re feeling sorry for him again, aren’t you?”
【World 2: General’s Wife × Beautiful Concubine’s Younger Brother】
【World Three: Frail Shiniang × Aloof Sword Cultivator】
【World Four: Arch-Enemy’s Wife × Young Cao Thief】