Nampo-dong is one of my favourite places to shop in the world. You can walk through these little streets of endless shops, restaurants, cafes, bars and food carts all day. It's great for souvenir shopping and clothes shopping with good quality things for a decent price. They don't usually accept bargaining, but knowledge of some Korean to make purchases helps. Come here hungry because you can feast on some of the best street food in the city as well.