@NotAWeebOwO
Spoiler!
As I said in my previous spoiler duke of addis is not a kana biological father he is her lover actually later kana will travel back time and possess her biological modern world mother because her mother is also summond by kana biological father but later duke of addis save her when he was young and kana told the duke of addis full story that this is her mother body and how she traveled back time he also told him to protect her when she is born but duke of addis already fall in love with her and he cannot accept that her lover later become his daughter that's why he is so indifferent to her and that's why duke of Addis known how to speak Korean