Transmigrate into a Book, and Become the Beloved Real Heiress

Looking for a Novel with a Gentle, Aloof, and Perceptive Female Lead

The Heroine Is Reborn, Learns Eight Languages, and Is a Top Student

The Female Lead Is the Real Heiress, Switched at Birth as a Child

The female lead is the true heiress. She was switched at birth, and after her family brings her home, there is either no fake heiress or the family greatly dislikes the fake heiress. She has lots of older brothers who dote on her, and many secret identities.

Looking for Stories Where a Fake Heiress and the Real Heiress Expose Each Other's Secret Identities! Ideally, the Female Lead Transmigrates into a Book

Please, I'm looking for a book where the female lead and the second female lead expose each other's secret identities, both have sound values, and the female supporting character is smart. The male lead... doesn't matter if there isn't one.

The Heroine Is the Fake Heiress

The female lead was originally the fake heiress. Then the real heiress came back, and the female lead returned to her birth family. At first, her birth family's brother wasn't very nice to her because the real heiress had told him she didn't want to come home and things like that.

The Female Lead Was Missing for a Long Time and Is Pampered by Her Brothers, No Secret Identity

No secret identities, and no little kids.

Transmigrate into the Fake Heiress’s Role, Only the Real Heiress Spoils Her Too, Preferably with an Actress Protagonist

I also hope both heiresses have plenty of secret identities.

Transmigrates as an Evil Stepmom and Takes the Kids on a Variety Show

I'd like to read books similar to Transmigrate into a Book as the Evil Stepmother in a Wealthy Family's Variety-Show Comparison Group. The kind where the female protagonist keeps slacking off and relies on the children to take care of her. The male lead can be practically nonexistent, but he absolutely must be good to both the heroine and the kids!!!

Reborn, Doted on by Four Older Brothers