Trashi

I cannot remember the name for one manhwa that I really liked but didn't finish, and I cannot find it whenever I try to search up the things about it.
It was a while ago that I read it, and also in my villainess/reincarnation hyper fixation period so some facts could be mixed up.

THE MOST IMPORTANT thing I remember is that the FL had silver to pink hair, that even the characters were commenting on that it was more silver and pink on the bottom. She often changed hairstyles I remember her with like two space buns but with longer pieces sticking out like twin tails
She saved the dukes brother (black haired duke, probably blue eyes)
He reminded her of her younger brother from before reincarnation and sometimes even mistook him and called him by his name Y-something, (Yull?) (she was Korean before)
The duke had an illness that slowly took his senses, I remember him not being able to taste any dishes, but then her cooking had a flavor for him.
They had a contract (?) and then got married but it was justified as being part of the contract (that's where I stopped reading)

I also remember the younger brother was done sort of a mage? When the older one was looking for him he set up like a barrier around the house that him and the FL was in to not be found.

Please help me find it in this ocean that is the reincarnation themed manhwas ┗( T﹏T )┛

I have this problem where I don't enjoy straight manga/manhwa quite as much as GL/BL cause it's either straight up porn or good but very safe, age-appropriate story.
In GLs/BLs you can often find both, an awesome, long story with character development for few dozen chapters and some quality spice, mushed up in a good manga/manhwa.
I'm looking for something like this but straight, maybe some villainess manhwa but with spice, and I mean real spice not, kiss and fade out to the morning after? Or present-times people with meeting because of an interest that they like? Are there even stories like that ?
Help