Chengdu, 2126

In Chengdu in 2126, vacuum pipeline dispatcher Li Shu was extremely sensitive to extremely low-frequency vibrations. He was troubled by a mysterious 7.8 Hz signal, but during tracing, the signal disappeared. Sanxingdui archaeological researcher Zhao Yunyi inherited a fragment of quartz stone from her great-grandfather. Four generations of the Zhao family have guarded this stone, but they have never been able to prove that there is anything abnormal about it. Their friend Zhang Xiao, who runs an old-fashioned Chuanchuan incense shop, is out of tune with this era of Sichuan cuisine where AI can cultivate spirits. Clues intersect underground in the Chengdu Plain. They made a surprising discovery.