If I had to guess, she's the real daughter. The current lady of the house brainwashed ever...

Gets a complex fl whos poor background actually helps and contributes to the story, a transmigrator who has a interesting ability and gives genuinely interesting and good advice, interesting side character that are also complex in themselves and you can see their actual importance to the story, a really good pace in terms of story progression - “webtoon is mid” LMFAOAOA

FL isn’t complex, she's your typical mary sue but at least she's aware that her knowledge is suspicously convenient in this new world. Side characters are not complex, ML is your typical abandonned boy who will find salvation through FL, and then they easily get a trust worthy subordinate who sees ML's potential as an emperor and becomes loyal right away.
It IS a mid story. It doesn’t mean it's bad, but it is mid. It will never see a grand success because it does not inovate the genre and does not have any distinctive edge either. I've read so many webtoons that I can say with confidence that this is mid.

And what other webtoons would you consider better than this? The only good one ik is the stepmother's marchen

Ouuhh in a similar isekai genre I would recommend:

- Your majesty please don’t kill me again
- I want to be you just for a day
- The villainess reverses the hourglass
- Death is the only ending for the villainess
- Who made me a princess
- Beware of the villainess
- Survive Romance
- Let's hide my younger brother first
- I became the hero's mom
- The fabled warrior
- Please don’t come to the villainess’ stationary store
- Resetting Lady
- One Husband is enough
- The Real daughter is back
- Actually I was the real one
- Ashtarte
- Villainess' repraisal boutique
- The one within the villainess
- Impossible NG
- I raised a black dragon

Many of them are finished or almost completed, so enjoy!

There's also a bonus I'd like to add, it's not an isekai or villainness and you can read it on Webtoon directly, it's Marionetta :) author is incredible and has made Hooky in the past as well

ヾ(☆▽☆)

I do agree with that and did you mean ML in the FL being a transmitter actually contributes to the story and makes sense they’re not just doing whatever the fuck because they don’t feel like not mentioning our current lifestyle in an old style setting to make it easier on themselves there’s a high chance that she was also brainwashed though DFL and that little circle, thinking she did at one point with her, just remembering her past life that makes a lot more sense than her being a transmitter. I’m not gonna lie that would be an actual grade like twist instead of her being a transmitter she’s actually just somebody who remembered her past life like awaken her third eye type of situation. It makes sense, but it would also make it very interesting if she actually isn’t the real girl, and there is another one who would make it very flavorful.