I adore Akatsuki no Yona (Yoon is one of my favourite characters) and I'm so happy to see the cast grow. I'm Andrea, and I play Sebastian here from Black Butler, who is also kind of a multitalented housewife and The Only Sane Man in his group. He'd appreciate Yoon, but since Yoon is a smart person that might not be reciprocated.
I'm not canon-familiar with your other character, but Sebastian's grown to dislike vampires while in Marina, so... vampire hate club?