Reborn as a Beautiful, Wicked Supporting Lady, I’m Spoiled by the Powerful

[Female supporting character transmigrates into a book + System + unconventional fake-versus-real heiress story + sweet 1v1 romance + satisfying power fantasy]

On my first day as the fake heiress, the System said, “Go on, take her resources, steal her spotlight, and grind her into the dirt.”

I looked at the real heiress, my older sister: round, almond-shaped eyes, a sweet dimple, and cuteness to rival a little ball of mochi.

Then I turned to the System and said, “Are you blind? How could you expect me to bully such an adorable sister?”

System: ???

I'm the number-one socialite in the capital's elite circles, with snow-white skin, raven-black hair, a slender waist, and voluptuous curves. My beauty is dazzling and intimidating.

I thought I'd come here to play the villainous female supporting character, but it turned out my sister was a total beauty enthusiast.

The first time she saw me, her eyes widened in shock. She murmured, “My little sister... is she a fairy?”

From that day on, this max-level powerhouse, with secret identities as a hacking mastermind, a mercenary assassin, and a top-ranking academic prodigy, became my ultimate superfan.

Her underlings were on high alert. “Miss, beware! The fake heiress might hurt you!”

My sister gazed at me, lovestruck. “Even when she glares at me, she's beautiful.”

Every day, the System screamed furiously inside my head: [Host! You're here to cause trouble, not to romance your sister!]

I got fed up, yanked the System out of my consciousness, and stuffed it into the body of a stray cat.

From then on, a foul-mouthed cat chased my sister around, ranting nonstop: “Do your missions! Steal her man! Take her resources!”

My sister crouched down and patted the cat's head. “This cat has such a good rhythm when it curses.”

System: ...Destroy this world already.