Legend says the Seventh Fairy slipped down from the heavenly realm to the mortal world and married Dong Yong.
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In Buddhism 天界 is the highest of the six realms of rebirth, home of the devas, whose bliss is long but still ends in rebirth. In Chinese myth and 仙侠 fiction it is the world of the immortals, set against 凡间 (the mortal world) and 冥界 (the underworld).