Insadong, Seoul, is famous for many of Korean stuffs so it is one of the essential coarses for tourist.
Originally, it is said that this place used to be well-preserved to show old style of Korea such as stuffs, buildings, restaurants(most of the restaurants in Insadong still sell Korean food though) and so on, despite of rapid change and severe reconstruction of Seoul city. But as tourists have increased, the original landscape of Insadong dissappeared and the many of shops which persuade monetary benefit appeared.
The function of Insadong, however, which provides Korean atmosphere for people, still remains and it keeps its fame to many people, not only to foreigners. (And I guess it looks different to foreigners campared to other regions of Seoul, considering so many oversea visitors in Insadong.) You can buy small souvenirs for your family and friend here:).And you will never fail to taste various Korean foods here!
Sometimes I visit here to feel its unique atmosphere as well. It makes me think what true Korean style is among this globalized world.