Cheongsu Udon Memil Naengmyeon is an old buckwheat specialist in Yeouido serving udon and buckwheat dishes, a nine-minute walk from Exit 3 of Saetgang Station. The memil jeongsik comes with buckwheat noodles and yubu sushi, and diners add the radish and green onion on the table to the tsuyu. Lines form at lunchtime and in summer, and food comes out quickly. The portion of buckwheat is a little small.