The thing is that if your not from Seoul, you have an accent, like Busan and Daegu, and are considered a "country bumpkin" of sorts. There's really not much of a difference just a little bit of pronunciation and slang just like any other county.
Koreans from Busan are considered rough, funny, and original.
Gyeonggi-do, surrounding Seoul, are often described as being cultured.
Chungcheong people, inhabiting the region embracing Chungcheongbuk-do and Chungcheongnam-do provinces, are thought to be mild-mannered, manifesting true yangban (landed or unlanded aristocracy,scholarly official) virtues