I stopped by Gyeongdong market after a meeting recently and discovered it is the only place (that I know of so far!) in Seoul that sells Seongsan nuruk in it's orginal flat cake form. Traditional market nuruk can be a bit patchy in terms of results, but I'm going to do a side by side brew test with online bought Seongsan and market whole cake Seongsan just for fun. The other two cakes are standard wheat of varying consistency and thickness, so I won't know how good they are until they are cracked open.