https://www.mangago.me/read-manga/the_villainess_i_possessed_is_raising_hell/ in this one the one who possessed the villainess is a demon but it mifht be this
Not this one u.u but it looks interesting so I'll read it! Thank you!
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I’ll Just Live on as a Villainess
https://www.mangago.me/read-manga/i_ll_just_live_on_as_a_villainess/
Yes! It was this one! Thank you very much!
ヾ(☆▽☆)
I think it was a reincarnation story, korean webtoon, colored. MC was a red-haired villainess (?) who reincarnated, ML a demon or something similar. I don't remember more than that...