After 8pm you can get discounted kimbap (beef and vegetable rolls) or chapchae (stir fried sweet potato noodles with vegetables) for 50% off if any are still available. I had some chapchae for around 2.14 for my dinner, good eats! The kimbap goes fast so try to get there before 9, you can get that for around 2.25 for 2 big rolls.
This large marketplace also has some of the most hardest to find korean items you will find anywhere. Whether it's a brand name korean soju, red pepper paste, or candy, this supermarket has it all.
There are also stalls inside the center that sell freshly made breads and pastries from the Lepidor bakery, and another one that sells fresh rice cakes. Along the outside, there are stores that sell electronics, travel tickets, as well as clothing.
For a one-of-a-kind experience into a whole different world, Greenland is the place to go.