You've Got Mail: A Cautionary Tale - Chapter 29 - For Whom Are You Getting Angry About?

This is a story of Xia An, a transmigrator from the end of the world, who transmigrates into the body of a cannon fodder who was the mother of the villain.

- Description from Wattpad

Genius prodigy ​Ji Yu married the icy ​CEO Gu Yan out of gratitude, assuming their union was a temporary transaction. Wrong. While she breezed through their sham marriage, Gu Yan—her “husband-in-name-only”—quietly rewrote the rules.Post-divorce, Ji Yu thrives: clubbing with models, sipping champagne, and flaunting her freedom. ​Post-divorce, Gu Yan implodes: stalking her parties, hijacking her dates, and growling, “Try replacing me. I dare you.”But fate laughs at their feud. On the night their divorce is finalized, a reckless encounter ignites—hotter, messier, and utterly unforgettable. Now Gu Yan, the once-detached tycoon, is addicted to the wife he never truly let go.“Marry me again. Legally. Shamelessly. Forever.”“No. But thanks for the one-night souvenir, Mr. Ex.”

Jiang Pengji got something called the Court Intrigue Stream System.
System: “Your goal is to become the most prestigious woman in the kingdom (the Queen)!”
Jiang Pengji: “Okay, System. No problem!”
Years later, she met the target by becoming the most prestigious woman (the Empress).
Jiang Pengji: “Well done, no?”

- Description from Novelupdates

Hiding in the Cold Palace and eventually becoming a Boss of Sorts. Li Mu was transported to a fantastical world and became a measly eunuch of the State of Xia. Despite having initially thought that his life would be a miserable one, he had unexpectedly acquired a check-in system.