Cheng Yan was called Cheng Yan because her mother saw a swallow flying across the sky the day she gave birth to her. If this happened in the warm spring, it would be nothing, but if it happened in the severe cold of minus 5 degrees, it added a mysterious color to her birth. Since ancient times, emperors and beauties always show some omen when they are born. Does the swallow that braved the cold wind and flew past Mrs. Cheng in front of her foreshadow the legendary life of this girl?
——The legend of Swallow