Atsumaro is an old Japanese-style restaurant between Cheongdam Station and Samseongjungang Station in Seoul, serving naengmyeon and spicy udon. The spicy udon is hot but keeps you coming back, and the cold noodles are a particularly well-made menu item. A husband-and-wife team runs the place, the space is small, and waits of 10 to 30 minutes happen. Portions are on the small side.