You know, I thought Karl Zeelen was Grey Enfield. He faked his death and disguised himself to hide from the world, but I didn't expect he is the Emperor of Koenig himself.
It's actually really bad that Monroe knows Sakura is a princess. If at any point she reports it back to her superiors, all they'd have to ask is the question "Of what country?" and figure it out.
Maybe they will order her to capture Sakura for them, since we know they really want her, and that is what will cause Monroe to defect to MC's side??