My foreign friends here are all ~*~free spirits~*~, as in they put stock in traveling and seeing the world and so forth. They know there's a couch in Stockholm for them; it's not goodbye, it's see you later, as the saying goes.
My Korean friends, though, are mostly of an age where that traveling is more or less behind them. They have already traveled and done all of that and now it's time to find a career. Either that or they're of the aggressive and ambitious type who intend to get into a career as soon as they can; forget taking time off to travel. Those goodbyes are goodbyes. They sting. And while I intend to come back to Korea, who knows if I will. Who knows if time won't diminish our friendships.
I've been singing a lot of this recently. It definitely makes it on to my "Korea: Round Two" soundtrack. It keeps me sane to insist to myself that we will meet again.