I suddenly got suspicious if this black knight is her brother who about to come back. I hope he isn't that one. Well maybe he's that Duke that she's about to get married. My imagination already runs wild at this point now.
If it's action manhwa then I wouldn't want it to be BL (even though I also read romance BL,too). So thank you very much for the end note, it made me wanna continue reading more. I like this kind of plot anyway. Thank you for your hard work.