
Same! There are 100s of villainess stories and most of them are barely average. I don't know which one is good and I don't want to read anything bad so I don't usually try them out. Only some of them are really good! But I never read anything like this in a villainess story. I do know a villainess story that has a good mystery but it's not reincarnation and the mc is also not the villainess. I would okay with a novel as well

hey so these aren't like what you said but...the og FL (poor commoner one) is actually nice in both of them.
beware of the villainess (fl is actually besties with mc, lighthearted)
kill the villainess (darker, mc actually wants to return to her world, fl and mc relationship is complicated but they're friends sorta)

It's called - https://www.mangago.zone/home/manga/annotation/the_holy_grail_of_eris/
And if you want some other recommendation to villainess stories with mystery as a subplot then you can try-
https://www.mangago.zone/read-manga/concubine_walkthrough/
https://www.mangago.zone/read-manga/death_is_the_only_ending_for_the_villainess/
https://www.mangago.zone/read-manga/survive_romance/
It would be nice to read a villainess story where the villainess (aka the mc) is poor, average looking.
All of the villainess story usually have an extremely beautiful and rich villainesses (that is the mc) along with poor commoner fake nice female lead (that later betrays the mc).
It gets annoying to read the same thing over and over again. I want to read a story where the villainess actually struggles a lot to change her body's previous actions.
It would nice if there's an underlying mystery in the story that she doesn't know about because she's not the original owner of the body.
it would be nice if the og female lead doesn't turn into a villain and acts like she is supposed to according to the original story ( just like how joonghyuk didn't turn into a villain in orv) and it would also be nice if the story isn't focused in romance or has slow romance that is good...