Went to their merch store afterwards (on a separate floor). Also very busy & loud. There was an area for social gatherings, and 8 or 10 people were sitting around playing skz videos, chair dancing, showing each other their precious treasures & squealing a lot.
I bought a skz keychain and a tin with cute stickers & photo cards in it.
I felt kinda out of place being there on my own, to be honest. And a lot older than most of the clientele.