Guan Jiugong was coerced by Japan's "Manchu Railway Investigation Section" due to gambling debts and had to crack the "Eight Shaman Secret Treasures" within 30 days.
The mirror is said to be able to reverse the fate of the country. However, the mirror body was dismantled and hidden in eight shaman altars.
Mendunjia's "Nine Yang Dunjies" are unlocked in sequence, and there is only one hexagram opportunity every day. If you make a wrong hexagram, all your previous efforts will be wasted.