She inherited the blood of her Great-Grandfather, Yu Jin-Cheon's Grandfather. He was the only leader of the Black Wind Squad. Black Wind Squad's Captain, Seven-Stages Abyss - Yu Wol, this was the name of Yu Jincheon’s grandfather. He was from the Black Wind Squad and, with strong affection from the bloodline of Bi Woon-Seong, who was the Heavenly Demon at the time, he eventually rose to the position of Cult Lord. Thats the moment the Heavenly Demon Family Bloodline changed to their Yu Family Bloodline which occurred two hundred years ago.
(Source: Absolute Dominion Wiki)
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