aine's Questions (2)

Hiiii does anyone know about a manhwa where the ML is a wizard of some sort (i forgot how they were called in the story) then the FL is a princess who fights for the rights of the wizards since they are mistreated by the empire and the royal family. then the ML usurped the throne for the FL but she died bc her (fake ass bitxh) sister convinced her to k!ll herself. if anyone were to know i'd greatly appreciate it if you guys can tell me!! (っ˘╭╮˘)っ

so i really cant remember how the title goes. i read this one before i made an account but i put it on my bookmarks but now i can't see it?? the FLs hair is red but because of some magical ornament it turns in to black. and if i'm not mistaken it's an isekai and the FL's part of assassin group called Owls. and the art is rlly very pretty and it's been bothering me for a few weeks now but i still can't find it. PLEASE HELP ME BEFORE I LOSE MY MIND