"Yangcheng Fantasy" is set on the shores of Yangcheng Lake and revolves around regional symbols such as crab shell celadon, gilt lanterns, and Suzhou embroidery stitches to construct a science fiction narrative that spans the earth's civilization and the memory network of the universe. The story interweaves characters such as Zhou Yanzhi and Gu Manzhen with Shen Shijun's quantum afterimages, upgrading Yangcheng Lake's crab cultural symbols (such as eight pieces of crabs and the rhythm of crab floods) into cosmic-level memory carriers, and explores the survival rules of civilization in memory symbiosis, quantum games and dimensional jumps. The theme focuses on the "cross-dimensional symbiosis of memory" - regional culture, as the initial encoding of the cosmic memory network, achieves a narrative leap from the earth's lakeshore to interstellar civilization through the cycle of "shelling out - breaking out of the cocoon - dimensionality", and finally uses the "crab shell-shaped cosmic memory network" as a metaphor for the diverse symbiosis and eternal flow of civilization, showing the awakening, game and nirvana of memory as a civilization gene on the cosmic scale.