So So Bom is a great little coffee shop located in Beomeo which serves both great coffee and homemade cupcakes.
The owner, Mr Lee, is a coffeephile who knows his stuff and he also sells coffee paraphanalia (coffee makers, grinders etc).
I buy my coffee beans from there (he usually has a selection) and haven’t been disappointed yet.
Plus the cakes are great.
For more info and directions (Korean only) see here.
Or, walk down the street to the left of Dunkin Donuts (Hwahap 11-gil), So So Bom is on the left hand side, opposite a Chinese restaurant.