Imagine living in a country where you don't know the language and can never learn it? Permenently. You will forever NOT understand what is going on around you. You will act on instinct, because that is all you have, and you will assume everyone around you is doing the same. You will have no idea what is really happening, ever. Everything will be subjective, you will be in a solipsistic space and they might all just be in your head.
Imagine how scary and confusing that might be.
Imagine how messed up that might be.
This is warped, I can't handle it, let's go to Korea.