Obok Susan Tuna Yeouido is a Japanese restaurant in Seoul that serves tuna as its main dish along with kaisendon and sashimi. It sits on the second floor in front of Yeouido Station Exit 3, where you can add uni to the kaisendon or order unidon, and also order kanimiso yaki and thick tuna hoe. Reservations let you enter without waiting, while lunch hours bring long lines that are better avoided. The rice in the kaisendon is sometimes firm, so the texture is not consistent.