This should be considered take-out only as their seating consists of 3 stools with no table. There was only one person working there when we arrived (the unit is pretty tiny) so I can imagine the wait can get long if there's a lot of orders ahead of yours. No complaints about the service.
We ordered the Oreo bingsu. The cup is filled with alternating layers of shaved ice and ground up Oreos. On top they put a scoop of Oreo ice cream, add two Oreo thins (which make it resemble a certain Disney mouse), and then pour some condensed milk. I found it to be just as good as bingsu shops that offer seating. The price was right to have a snack while we walked through the mall.