The Mystic Nine refers to the nine tomb-robbing families in old Changsha, which are often mentioned in the tomb-robbing notes.
They consist of the upper three clans, middle three clans, and lower three clans respectively.
Upper Three Clans:
Zhang Da Fo Ye (Zhang Qishan)—unknown
Er Yuehong—has three sons and taught Chen Pi Ah Si and Xiao Hua
BanJie Li—Li Sidi (guess)
Middle Three Clans:
Chen Pi Ah Si—Chen Wen-Jin
Old Dog Wu, Fifth Master Dog—Wu Yiqiong, Wu Erbai, Wu Sanxing—Wu Xie
Black Back the Sixth—the only one in the Nine Gates without any offspring
Lower Three Clans:
Huo Xiangu, Madam Seven—Huo Ling—Huo Xiuxiu
Qimen Fortune Teller Qi Tiezui the Eighth—Qi Yu (guess)
Xiao Xiejiu—Xie Lianhuan (Xiao Hua’s uncle) and Xiao Hua’s father—Xie Yuchen/Xie Yuhua (aka, Xiao Hua)
Those who participated in the archaeological activity in Xisha were Zhang Qiling, Li Sidi, Chen Wen-Jin, Wu Sanxing, Huo Ling, Qi Yu, and Xie Lianhuan, whose surnames are "Zhang, Li, Chen, Wu, Huo, Qi, and Xie". These are completely consistent with the Mystic Nine's surnames, which shows this wasn’t merely a coincidence…