I think he finds it strange that he became worried as Nakyum seemed to have passed out, because he checked his forehead temperature. Remember, Nakyum became very sick after one of their intense episodes. So he feels strange that he cares...
I love how this manga / translators just throw "fucks" casually here and there.
Anyways, I do hope she has some teensie weensie bit of feelings for the prince that's why she's putting up with all these. Otherwise, I'd love for her to get a knife and kill everyone who tries to stop her. (▰˘◡˘▰)
Help!!!! Ayudameee!!! Hahahahahaha