Don't be fooled into thinking you have to live in one of the largest cities in Korea to have an incredible time. Slightly smaller and less well-known locations can offer all of the conveniences of larger cities, but often with added perks including less traffic, noise, and a closer foreigner community. Some highly desirable middle sized locations include Suwon, Jeonju, Ulsan, and Jeju.
Suwon is located less than an hour from Seoul via subway. It's also a historical city with a beautiful fortress cutting through the center of town. At night, there are multiple vibrant parts of town filled with local university students and English teachers at a multitude of restaurants, bars, clubs, and shops. Jeonju is famous for it's Hanok (traditional housing) Village, which draws tourists from around the country. Ulsan is a beautiful port city and major center of commerce, located adjacent to Busan in the southeast. Finally, Jeju is considered the Hawaii of Korea. It's a subtropical island south of the peninsula. It can be accessed from the mainland by plane or ferry and is one of the most popular vacation spots for Korean year-round. It features beautiful volcanic beaches, and lush scenery.