One of my favorite food/drink finds so far in Korea are these to-go iced coffees. They sell them at all the 7-11 quick mart types of places, but this one happened to be in the subway last Saturday as we were heading to the palace.
You pick out a flavor (I chose green…I have no idea what the actual flavor was). The packages are a bit like a giant capri sun. You take the package up to the register and pay and then the cashier will give you a straw. Then you go back to the freezer (below the ice coffee display) and get yourself a to-go cup filled with ice. By the way, I know all of this because I watched two other girls do all of this before attempting it myself.