During my time in Korea I visited many coffee shops because I am addicted hahaha!
my friends from the university we used to go often to the stores that were near the area, I must tell you that what I remember most of all are the delicious cakes, I don't know how to explain but the taste of these Korean sweets are very different from those I've tried in the rest of the world and they are my favorites!
If they visit seoul, they should try it at least once, no matter which store they go to! they are unique!