Geu Yetnal Jeuksuk Jjajang is an old gisa sikdang in Seoul that serves old-style potato jjajang, udon, and mandu guk. The jjajangmyeon contains large chunks of potato and a generous portion of noodles. Taxi drivers frequent this gisa sikdang, and jjajangmyeon, udon, and mandu guk are the main menu items. As an old establishment, modern hygiene and tidiness are not to be expected.