I've been here a couple of times and have enjoyed my visits to Snowtime for their bingsu desserts.
My favourite is definitely the injeolmi bingsu. If you haven't been here before or haven't had bingsu before, then you got to try the injeolmi one - it's literally the classic. Bingsu is a unique dessert that's based off finely shaved milk ice with various toppings. The injeolmi bingsu is a nutty explosion coming from the ground beans. There's chewiness coming from the mochi, creaminess of the milky shaved ice, and it's happiness in your mouth. It's layered pretty well even in the large sizes. Personally, sharing a regular sized one for two should suffice but upgrading to a large is definitely worth it to share as well.
Snowtime is a rather small and popular place, where people take their time while eating their desserts, so expect it to be packed if you come here during the weekends. I also really liked how lounge-y this place feels, with a comfortable atmosphere.