I'm a Villainess, Yet I Rampage with Prayer Beads in Hand

(One-on-one romance, doted on by everyone, strong heroine, secret identity, tragic romance) She, bearing the title of presidential instructor, is crowned in a black robe, second only to one and above countless others, a position known as The Outcast. Her temperament is capricious, her bloodlust and violence unmatched. She can summon wind and rain with a turn of her hand, and her methods are exceptionally ruthless. She is so revered that none under heaven can rival her. He is born into a prominent noble family, a revered presence among the most powerful. He accidentally wanders into a war zone, where she saves him and then imprisons him. Under torture, an unexpected blood donor is born. He runs, she pursues. There is no escape, even with wings! Heaven or hell, the ends of the earth, they will fight to the death!