It is the city where the most popular religion of Korea, Confucianism, was born.
My suggestion
The city itself is not very beautiful, but it is a good base for accommodation and for easy access to the surrounding region, such as the traditional village of Hahoe.
South Korea is fascinating when it comes to cookery: each day after work, Koreans meet up amongst friends in restaurants or street stands to talk and relish low-priced dishes.
Seoul is an ideal place to visit if you want to really get to the heart of Korean culture, in all its strange exoticness! Shops, culture, food, things to see and do: you're bound to find something you'll enjoy during your visit!