Wellbeing Ongsimi Kalguksu is a noodle restaurant in Seoul that serves potato ongsimi, buckwheat kalguksu and makguksu. Its signature ongsimi buckwheat kalguksu comes with chewy potato ongsimi and soft buckwheat noodles. Before the meal, barley rice, yeolmu kimchi and mu-mallaengi muchim are served as basic side dishes. The makguksu is divided into mul makguksu and bibim makguksu, and the broth is on the rich side.