UPDATE: [Crisis averted 😀 ]

Hey!

I'm trying to find a manga or manhwa that goes a little like this:

A magical/mythical creature, much resembling a unicorn, I believe loves this woman. When she dies, he takes care of her two daughters. However, one of those daughters has this disease that causes her to age backwards. It may or may not be caused by the aforementioned creatures.

I found it in my library one day, and I can't remember the name or much more of the plot ;A; I know the art style was very detailed and flowy~ It looked like a much older book than the ones made more recently. A very "classical" art style.

Demon Sacred ?

might want to read Sakuranbo Syndrome

There's only one truth, but hundred versions of one single thing

Omigod yes!! This is the one! Thank you so much <3

@miskatsura
That one looks a little weird lol XD