There is no spring or summer in Evergreen City, only the shadow of the fox guards the evergreen. Qingyao was born on a white dew night, and it is said that there is a thousand-year riddle hidden in her eyes. There is a prophecy spread in the city that "fog rises from the green mountains, foxes roar at the third watch, and the truth turns into mist and rain." Qingyao originally wanted to stay in her study quietly, but because of a riddle without an owner, she was involved in the vision of the city's spiritual veins failing and her years turning back. She pursues the clues left by the Fox Fairy, and walks with the hypocritical prayer master, the old tree that becomes a spirit in riddles, and the boy who forgets his real name.
The answer to the riddle is like a floating cloud, and it is difficult to tell whether it is true or false. What Qing Yao explores is not only the secret of Evergreen City, but also her own origin and lost bonds. Is the Fox Fairy's blessing a gift or a shackle? When the answer to the riddle is revealed, how will Qingyao write her own riddle? The fate of Evergreen City will eventually be overturned in the palm of her hand.