Careful, they're piping hot!
In the subway station you'll find a snack shop that sells typical Korean snacks like fish cake, and they also sell a type of Deli Manjoo (custard filled bread bites) shaped like chicks called 삐오꼬 (Ppiokko), as well as 호두빵 (Hodubbang), which are little walnut bread snacks. There are lots of things that you can buy in the park as well, but I always make an effort to buy a bag of these before because they're cute and super delicious, plus it's only 2,000 won! Along the road once you leave the station you can buy kimbap, rice cakes, tornado fries, ice cream, grilled squid, and there's even a KFC there. If you're more adventurous you can also get silk worm pupae (번데기/Beondaegi) or tiny sea snails (소라/Sora) boiled in water and served with little toothpicks to eat.