Rumi:
Her father was a demon, her mother a demonhunter. Both died after she was born, an old friend of her mother, Celine, took care of her. Celine always told rumi that her demonpatterns must be hidden, and they need to fullfill the hunmoon, to erase all demons from the world, and make her patterns dissappear. 
Jinu:
400 years ago he was poor, he made a contract with the demonlord Gwima, so he willbe rich. He left his mother and his little sister alone. But he became a demon. And full of guilty