Death is the only ending for the villainess is really good about this. People who were horrible to the og villainess really like her now, but she doesn't forgive them, because she keeps thinking of how lonely the og must have felt.
The one within the villainess is exactly what you're looking for, except with more steps.
Og villainess is evil-> gets replaced by reincarnation, but is still aware of what's going on -> The reincarnated villainess becomes hero, because she loves the og so much, that she wants her to live a good life -> Og villainess also loves her, even though she can't talk to her -> Something bad happens to reincarnated villainess, that makes them swap places again -> Og swears revenge, so that reincarnation may live a good life again.
https://www.mangago.zone/read-manga/the_one_within_the_villainess/ honestly this one has so much worshipping undertones that in an alternate universe, this would be a GL
Can anyone give me recommendations where the mc possessing the villainess doesn’t forget about her and still loves/thinks of her. I think it’s so sad the og villainess is just forgot and hated for misunderstanding/ being hurt from the people around them.