The seventh day of the seventh month in the lunar calendar is Chinese Valentine's Day. There is a beautiful legend about this festival: Zhi Nu, the youngest daughter of the Queen of Heaven, fell in love with Niu Lang, a cowherd on earth. Zhi Nu's mother was opposed to the love between a fairy and a human, so she separated the two lovers with the Milky Way. However, their love story moved the magpies on earth. Those magpies gather together annually on the seventh day of the seventh lunar month to form a “magpie bridge”，so that the couple can meet each other once in a year. Today, on this day, young girls often pray to Zhi Nu in the moonlight, wishing for a happy marriage.