Seoul is, for all intents and purposes, the center of everything you'd do for travel around Korea. And while I don't feel bothered by the pollution or city noise, if you don't like Taipei, it will be hard for you here. Much bigger.
Even if you stay in the suburbs, it will still be dense. As far as expat communities go, sure, they exist in other places, but they're smaller.
If you go somewhere in the countryside, like Gyeongju, that's a tourist destination, you can get around to a lot of places. But staying there for two months, I think you'd be bored. There are few foreigners and really few things to actually do there.