Since it just opened a few weeks ago, everything is still not organized. This place does not give out numbers when you are lining up, so you just talk to the waitress and she will "remember" you (that's what she said).
I ordered the strawberry and mango binsu, both tasted like artificial flavors. They probably just pay to advertise, totally not worth it..
If you really want to try a real Korean shaved ice, you should go to Snow Time instead, which is in the same plaza.