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It's a shoujo manhwa, wherein the FL is like a semi-saintess and the ML is a duke. And the antagonist female chara(the official saintess, a summoned one I guess) is a b*tch where she stole the ex-fiancé of the FL. ML is silver-haired.
I read it in a different site and forgot to bookmark it ˚‧º·(˚ ˃⌓˂ )‧º·˚