>However, if you get smitten by a more western lifestyle in the US or Europe, it will be very hard to return home.
Anecdotal, but I can confirm. I work for a Japanese bank in NYC that has a lot of Japanese expats. A few weeks prior a new expat came over and he was in awe of being able to start work around 8:50 and leave at 6:00, and how easy it is to approach the managers. Meanwhile, the expats that have been in NYC for a while are dreading returning to Tokyo.
My thinking is that Japanese and Korean work culture is quite similar. So if you want to live in that culture, why not do it closer to your family?
However, if you get smitten by a more western lifestyle in the US or Europe, it will be very hard to return home.