could someone please tell me who is that blonde guy and what just happened in last panels

I think someone blasted the palace at the end

first that woman fainted and the blast followed that. Was it somehow linked?

Wasn’t he the friend of the maid? The one who purposely went on a walk with duchess so they spread rumors that she’s cheating on the duke then the duke miss understood and asked her to hide her lover?

Hah? Which chapter is this?

It was really in the story I forgot which chapter specifically!