Pangu opened the sky, and his essence turned into books. Four strange books are divided among the four tribes: "Nong Jing" nourishes the people, "Huangdi's Foreign Canon" heals people, and "Book of Changes" observes the sky. The most mysterious one, "The Wordless Heavenly Book", contains no words, but contains the secrets of Qimen Dunjia and numerology. It has been guarded by the Wangshui tribe in the north for generations, and they have sworn to "only guard the land and not seize the book."
Xuan Yue, a girl from the Wangshui Tribe, opened the "Water Spirit Eyes" at the age of three, and could see the secrets of heaven on the water's surface. She was the person chosen by the Book of Heaven. During the ceremony to ask the sky at the age of fifteen, she glimpsed a bloody prophecy: the flags of the three tribes of wood, fire and gold would cover up the sun, and the city would collapse if it were water. My father suppressed the warning and secretly prepared the city defense, but he could not stop the traitor from breaking through the formation, destroying the city and destroying the family. Seventeen-year-old Xuan Yue broke out of the waterway with an "empty book" in her hands and has been in exile ever since.
Bai Gui, who seized the book, found that the Book of Heaven was empty at the book opening ceremony, and the alliance broke up on the spot; the Book of Heaven fell into the hands of werewolves, who were regarded as inferior foreigners, and actually caused the moon god to resonate and the wolves went crazy. Xuan Yue and her abandoned son Cang Wu traveled north together to save the refugees and Buqimen, create a "heavenly punishment" vision to disintegrate the three tribes, and then reunited in Xuanshuizhe, repaying evil with kindness to influence the old enemy Yan Chi.
On the night of the final lunar eclipse, the truth emerges: the wordless heavenly book uses the heaven and earth as paper and the human heart as ink. Only by letting go of obsession and looking at each other with protection can the words appear. Xuan Yue established the "Five Tribes Alliance" and made the Book of Heaven common to all human races. Many years later, the four tribes merged into the future Yanhuang Chiyou. The Book of Heaven turned into water and flowed into the Yellow River, leaving only eight characters - no characters are not empty, and the human heart is the sky.