Responses
I think it's because he's already so smitten with Ennid that he won't use the potion!(≧∀≦)
SPOILER ALERT
The dragon blood in him doesn't recognize Ennid as his mate (I'm not sure if this was mentioned in the webtoon but it's in the novel), so he expects that if he were to use the potion, someone other than Ennid would be shown
glunn still hasn't used the potion from ennid either, why wouldn't he just see who his future spouse is supposed to be instead of hounding ennid give him a break bro he's going to blush so hard his brain will fry