Be prepared to wait if you come! I don't know how it is like on weekdays but I came on a Saturday right when they opened (3pm) and they had a lineup within 30mins. They have enough seating for ~30 people. The speed of the service doesn't help either as it took 25 minutes for our order to come. The table next to us ordered a minute after and theirs came in 40mins. I don't know how it's made but they really need to step it up.
I ordered the Matcha Redbean Bingsoo ($9.95). It had matcha, redbean, almond slices and mochi. I liked how it wasn't just a bunch of toppings on top of the shaved ice. The toppings were mixed throughout the shaved ice which was nice. They also had a little container of condensed milk for us to pour over the shaved ice.
Also, the plaza that it's located in it is pretty hectic. I wouldn't say it was too busy when I went as I found parking right away, but there were a lot of drivers who weren't paying attention to other cars or they didn't care if they were stopped right in the middle of the road and blocking all traffic. Be careful if you're driving here.
Overall, despite the wait time for food, I would come back and try their other flavours. I do hope they pick up their speed on orders.