Hmm...

Nameverse is when a name is imprinted somewhere in the body which can help identify who your fates pair/guide/Esper is. Like How the main couple has eachothers names in a different language on their backs.

Yeah. The first one I saw with that premise was Pian Pian (now idk if it was THE first manhwa to do that concept, but it's the first one I saw, bakc in the day)

I see, thanks for the explanation