because they're webtoon and meant to be viewed on mobile, they have large spaces for suspense or to set mood or have a pause in the narrative
I find that the only mood building within me is a mild annoyance. It seems in every chapter of Royal Servant, there's 15 blank pages.
Webtoon is basically to be viewed best in vertical scrolling mode, not in a basic manga reading horizontally. When seeing in the scrolling mode, you don't want to accidentally read the 'next page' while reading a certain part. The mood you find is basically because what supposed to be read vertically becoming read horizontally. You will find a mild annoyance to if it's vice versa. Try to read it in 'multi pages' view so maybe the annoyance won't be there.
Why do so many korean manhwas have giant white spaces in between panels? Like, I have to scroll down 2 pages to see the next scene.