Y’all... is the “villainous Grand Duke”... the love interest?

I saw some spoiler and they said that he is the love interest

I have a feeling that dietrech rescued her as a child and already knows that he and her are not blood related. Maybe seeing a baby in distress made him want to take care of it, or maybe he just wanted to protect the thing his mother died for?

Sigh. I’m not going to read this...

I don’t want another beware of the brothers. I’m already scarred from that. ┗( T﹏T )┛