Songnisan National Park, North Chungcheong Province
Mokyokso pond, where it is said Sejo, the 7th king of the Joseon dynasty, was taking a bath to cure a skin disease after holding a religious service to pray for the prosperity of national destiny in Beopju-sa temple. A handsome boy named Prince Wolgwang appeared according to the command of Bhaisajyaguru and then disappeared after saying 'Your skin disease will be cured soon'. After King Sejo completed the bath, miraculously, his tumour was removed cleanly. Since that time, it has been called Mokyokso.