During the period of King Weonseong of Shilla, the Gimje Governor who wanted to marry his daughter Danya to a civil engineer Weondeokryang attempted to sacrifice the fiance of Weondeokryang to a dragon, but Danya who detected her father's trick in advance offered herself to the dragon as a sacrifice for the prevention of her father's murder and happy life of Weondeokryang with his beloved. People dedicated Danyagak and Danyaru together with her portrait in commemoration of Danya's filial piety and sacrificial spirit.