Gijang Sonkalguksu
Located off a side street in Seomyeon Market, this is one of the most famous kalguksu (knife-cut noodles) joints in the city. The broth is savory and clean, and the noodles are all made the old-school way: by hand. You can choose between mool (with broth) or bibim (no broth, with chili paste). Look for the line.