Cheonghakdong Naengmyeon is a naengmyeon restaurant near Gwangnaru in Gwangjin-gu, Seoul, serving arrowroot naengmyeon. It offers mul naengmyeon, bibim naengmyeon, and mul mandu, and the bibim naengmyeon can be ordered with the sauce on the side. Arriving late at lunch means waiting, and the hot broth is self-served, with arrowroot juice or arrowroot water provided as a palate cleanser. Both the bibim naengmyeon and the mul naengmyeon mixed with the sauce are spicy.