Seonyudong means the place where fairies come down from heaven to play. It has been said that fairies would often come down to the valley to make liquor and store them in flagons. There are some leftover depressions in the boulders which demonstrate there may be some truth to the legend.

Near Seonyudonggyegok Valley, they say that the bamboos and pine trees stay green all year long and wood nymphs fly down to play with each other under the Suwolpokpo Falls in Suwol Village.