I think we're making a bigger fuss than we need to but I'll follow the approach of ranking. XD

8. Belfast
7. Glasgow
6. Seoul
5. Dorset
4. Gumi
3. Leeds
2. Jeonju
1. Geoje Island

It looks as through our top 3-4 are looking like the UK but that doesn't mean we could eventually wind up in say Korea. I mean who knows how the magic might work, one tree in the fantasy world may take the heroes somewhere else in the world that we know now. But then again that might be adding too much to the pot already. Personally I'd be cool with Belfast or Glasgow and it seems like Glasgow might be the route to go. I think when I saw your suggestion, I already knew we'd be going with that.

So we have the setting in order, we could narrow down the [url=https://en.wikipedia.org/wiki/Category:Further_education_colleges_in_Glasgow]colleges/universities[/url] where our characters would be coming from.