A Villain Demands to Be Loved?
That's not it but this one looks good! I'll add it to my list, thanks!
Most likely this one https://www.mangago.me/read-manga/that_villain_s_life_i_ll_live_it_once/
This one https://www.mangago.me/read-manga/my_husband_is_possessed_by_the_main_character/ also has a reincarnated FL and transmigrated ML but I'm pretty sure it's not what you're talking about (they find out about each other a lot later)
Yes, that's the one! Thank you!
There was a transmigration novel where both the fl and ml where transmigrators who found out about each other and started working together to survive in the new world or something. Does anyone remember anything like that? Thanks