Dong Yong and the Seventh Fairy is a Chinese legend centered around a romance between an orphaned Han-dynasty man named Dong Yong and the Seventh Fairy, the youngest daughter of the Jade Emperor.
The youngest of the seven fairy maidens was in search of her lost weaving equipment and her "coat of feathers," without which she was unable to fly.
Before the couple can begin their life together, the Jade Emperor orders his daughters to return home.
However, he is kind enough to allow the couple to reunite once a year on the 七夕 (the 7th Evening) -- later known as the traditional Chinese Qixi Festival—by crossing the Milky Way.
[1] In memory of this story, ancient Chinese astrologers named two prominent stars that stand at a distance from each other 牛郎, "cowherd man," and 織女, "weaving girl."