Myeongdong Kalguksu in Seoul is an old kalguksu shop that serves kalguksu and mandu-guk. Each bowl of kalguksu comes with one mandu, and the clear broth and chewy noodles are its defining features. Food arrives about 20 minutes after ordering, and kimchi and kkakdugi in jars come out with it. The shop is always full of customers, so there is a wait.