There are shamanic temples dotted around Seoul, maybe one or two. But most of the time, they operate out of commercial temples called gutdang (Korean: 굿당). A shaman will rent a room for the day, and customers meet her there to carry out the ritual. There could be five rituals going at the same time in this building, the shamans go where the clients are. There are over 400 shrines on the rural island of Jeju which the people there have worshipped for centuries, it is the highest concentration in Korea taking into account the Island's small population. The fact that the local Buddhist tradition had gone nearly extinct under persecution by the Neo-Confucian Joseon state, so that there remained very few goldfish monks.