I've been living in Japan for two and a half years - in fact, I just passed the 30-month anniversary yesterday! I haven't been out of Asia in that time, and I certainly have had moments where I've been homesick.
One way to feel at home is to eat comfort food. I've managed to lose a good bit of weight (not enough, but still some) but it doesn't mean I can't have a bit of tasty goodness to remind me of home. I can cook some dishes and there are plenty of international restaurants in Tokyo, but some truly authentic foods are tough to find in Japan at a reasonable price.
Seoul afforded the opportunity to have some dishes I don't usually get in Japan, plus a few "Korean" versions of western food.
There are a few chain restaurants in the area, and I had a banana sundae at Baskin-Robbins one night.