help me find this please!!

Hii, as the title says, please help me find this story! I cant remember what kind it was (manwha, manhua, or webtoon)
but it was a historical/fantasy/romance story that centers around a pink haired female lead in her adolescence. I'm unsure if its an isekai story, but it isn't a big part of it. I believe at most its 20 chapters, completed, and uncolored.
her love interest is a black haired boy with bangs, and hes not good at magic. but he is very skilled with talismans (that or written spells)
spoiler warning, but an imperial blonde prince attending there school gets a crush on the mc, she rejects him but he takes it as her playing hard to get, and he challenges the black haired boy to a magic duel
of course, black hair wins
if you can find it, it would be a legit blessing. I spent my whole 8 hour shift combing through roughly 300 pages worth of tags....