In the context of folklore, Yang Jiujin, a young man who returned home, discovered that the "cave burial" custom in his hometown was actually a parasitic ritual for the "silver root" of extraterrestrial silicon-based life. As the seventh-generation "vessel", he struggled between the fate and free will of the seven-generation cycle, and finally transformed from a victim to a gatekeeper, completing civilization-level choices and sacrifices on the winter solstice.
