Concubine Yue, who rose from being the emperor's wet nurse, feared losing her beauty and the emperor's favor as she aged. Seeking the art of eternal youth, she went to Qingqiu but mistakenly identified a weasel spirit, Huang Wanwan, as a fox spirit. Yue Zhen'er lured Huang Wanwan out of seclusion, murdered her cruelly, and extracted her demon core to preserve her own beauty forever.