COMPLETED, ROMANCE REVENGE MANHWA!
FL has black hair, two siblings (1 golden hair sister who cheated with her fiance and 1 brother who is a psycho serial killer)
is considered to be the richest person
ML has a white hair and looks like a puppy, holy knight, friends with the priest, is actually a prince.
has 3 children, twins and a baby girl that are spoiled by their grandfather
the story is already completed with with side chapters
Fl has white hair and Ml has Black hair
Fl transmigrated to a novel and she was a a second female lead, and Ml was the OG ML. In the first chapter/prologue, it was in the last part of the novel and ml was dying, then Fl tried to save him using her life. And then she went back in time, when she was saved by the ML
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I think it's this one! ( ╹▽╹ )
https://www.mangago.me/read-manga/the_obsessive_male_lead_made_me_the_female_lead/
Fl has white hair and Ml has Black hair
Fl transmigrated to a novel and she was a a second female lead, and Ml was the OG ML. In the first chapter/prologue, it was in the last part of the novel and ml was dying, then Fl tried to save him using her life. And then she went back in time, when she was saved by the ML

I personally believe that great manhwas takes time and care to even be considered one. As much as I love fast updates, authors/and artists uploading 1-2 chapters per week, you could really tell how much it ruins the story. Instances like, the art becomes a flop, or the plot becomes too vague or too faced paced.
I hope publishers could take these popular manhwas that everyone loves and adore, as an inspiration. Most of these popular manhwas were first published in 2017+, and only a few of them are completed. It takes a lot of consideration to make great story and art for audiences to enjoy.
Anyways, thanks for reading!
Let it marinate for few chapters then binge read it