Looking For Manga

I read a yaoi a good while back where the top was a dominant Omega, can't recall the name...

Both the fl and ml reincarnate into a novel. Neither of them the other has in the beginning. The ml is a prince or someone like that has black hair and died of an illness in his past life and his character in the novel is sick/weak/second prince?……

I'm looking for a manhwa where the girl mc has pink hair and she's a smut manhwa author and wants to have 'experience' with that, I just can't remember the name someone HELP