牛郎 (Niúláng) was a poor cowherd who fell in love with 织女 (Zhīnǚ), a beautiful silk
weaver, in the myth The Weaver Girl and the Cowherd.
Since Zhīnǚ descended from the gods, the Queen of Heaven would not allow them to be together. She sent her bodyguard to drag Zhīnǚ away from Niúláng and their young children, and between them she created a mighty river, which is how the Milky Way came to be.
However, because their love was so strong, the Queen took pity on them, and so once per year, she allowed all the magpies of the world to form a bridge over the river so the lovers could visit each other.
Their reunion is celebrated as the Chinese Valentine’s Day on the seventh day of the seventh lunar month, known as 七夕 (Qīxī), “the Seventh Dusk”. In 2018, this will be on August 17th.
Ok. That's romantic. Baidu Baike