@Stuart ********
if by pnr you're asking if I'll get a ticket for Seoul to Brussels with a stopover in Bangkok...no.
I'll get 2 return tickets: Brussels-Bangkok and back..and Bangkok -Seoul and back.
From what I read online, it should not be a problem, since when flying back I won't leave BKK airport, but will instead fly onwards home to Brussels. I just want to check if that is correct.