The prophecy of the sky comes true, the green dragon dominates the Yangtze River, and the white tiger roars across the forest sea. Biologist Yun Che holds the ancestral "mythical beast decoder" and is shocked to realize that they are actually the "weeping scales" of the earth's ecology! Where the water quality deteriorates, the green dragon lurks, and when the ax weighs heavily, the white tiger hangs low. Refusing to fight, he roped in Lin Lang, a tough-talking and soft-hearted engineer, and Atuna, a tough Oroqen girl who protects the forest, to form a "human-animal collaboration team." While looking for ancient teachings in the Classic of Mountains and Seas, we used modern means to dredge rivers and designate protected areas. When the green dragon takes the initiative to lead the way to find the source of pollution, and when the white tiger cub nuzzles Atuna to beg for food, Yun Che understands: the myth is true, and the power of guardianship lies in joining hands to rejuvenate the unbalanced mountains and rivers.