When talking about dessert cafés in Hongdae, you can’t fail to mention Mobssie. There are two branches located in the Hongdae area, but visiting one doesn’t mean you’ve seen all they have to offer. Mobssie’s branches are uniquely specialized in different desserts; Branch No. 1 focuses on chocolate cakes, while the second branch serves up decadent cheese cakes. Mobssie Branch No. 1 is particularly popular among young women in their twenties. The cakes are baked upon order so that every customer gets the warm chocolately goodness of fresh cake!  The taste is so rich, you will feel your fatigue melting away with a single bite.

Address (Branch No. 1): 34, Wausan-ro 27-gil, Mapo-gu, Seoul
For more info: http://english.visitkorea.or.kr/enu/FOD/FO_EN_6_4_4.jsp?cid=2471362

Korea Tourism Organization website