Gui Daehak 구이 대학

This is what we mean by the great hole-in-the-wall lunch stop that's a well kept secret.  Super packed with locals around lunch time, Gui Daehak serves a mean grilled fish.  It feels like you're camping.  Their Jaeyuk Bokkeum (spicy stir-fried pork) is hot and tangy.  And seriously, the Changgukjang is something you should try, despite its stinky reputation.  It smells awful but is as satisfying as a bowl of chili.  It's a no-frills place, so expect no room for your bag--and no room for dessert.