Spoiler!
Duke know kana come from korea because kana biological mother also come to this world from korea and after the long story will know that kana time travel and possess her biological mother body duke adis fell in love with her her mother come to this world because her biological father are summoning items and living beings from other dimensions and that's why the black fog is appearing kana also teel the duke addis that this body is my biological mother and the full story of her and tell her that when her mother give birth to me please protect me but duke also love her romantically so when he see young kana his emotions get complicated and when kana disappear from her mother body her mother who come from the modern world thinks he is a bad guy and then she curse the duke.
