Oh i read something similar! The Villainess Needs a Tyrant. Though it might come close to a slowburn since FL has gap in her memories after reincarnation but its a nice and light read!!
https://www.mangago.zone/read-manga/the_villainess_needs_a_tyrant/
And!! Before i forget. The Tyrant Wants To Love Honestly is also so so so good. The FL is the tyrant and the ML is some secretary of sorts. She regressed as a child again and wants to give them both a second chance
https://www.mangago.zone/read-manga/the_tyrant_wants_to_live_honestly/
different from the what you asked for, but in this one both mcs are in love with each other. And their relationship was really beautiful
https://www.mangago.zone/read-manga/june_peach/
Forgot to post the link
Most of the Mangas in the above categories has shitty ML's who treat the FL horribly and are shocked when she doesn't like them and when she reincarnates she has to do all the work to make them fall in love with her.
Yes sometimes it's the FL who was shitty first, but a lot of them the ML is rude first.
I want to read one where the ML is just an absolute puppy and in the original story the FL treated them badly, so reincarnated/isekaied FL feels so bad they treat him well and he's just absolutely over the moon that's she's now in love with him