Haha you better cry a lot now because I found the manhwa you are looking for! <3 I have read it in the past so I remember the storyline! Here you go -> https://www.mangago.zone/read-manga/daisy_lisabel/
Have a good time reading it!
Ah thank you! I actually found the one I was looking for and it was different but I'll check that one out too!! :D
This is the one I was thinking of: https://www.mangago.zone/read-manga/daites_ryou_koubouki/
Oh warning tho apparently based off the comments that story ends up getting pretty problematic :/
Idk if anyone knows it but I have one I'm looking for that's not fully BL, but the mc is a girl who gets isekaid to another world where she's a duchess and she's incredibly smart. After fixing her little kingdom she also introduced the fantasy world to BL novels. She ends up marrying a prince and he's got a close assistant who she ships him with and it turns out they're together too. Does anyone know what it is? I think she's got purple hair, the prince has black hair and the assistant has white hair. If anyone knows I would cry