In order to solve the mystery of the mine, they decided to engage the help of Er Yuehong (Lay Zhang), who was an opera singer that came from a family of archaeologists.

In order to procure the medicine for treating her, Zhang Qishan travelled to Beiping with Er Yuehong, Ya Tou, and Qi Tiezui, the eighth leader of the Mystic Nine; they met the young mistress of the hotel Yin Xinyue (Zhao Liying) there.

Chief director, Liang Shengquan has previously directed many well known dramas including The Journey of Flower, Swords of Legends and Chinese Paladin 3.

[4] Chapters related to the character Zhang Qishan (portrayed by William Chan) gained over 70 million readers not long after the announcement of the cast.

[6] The Mystic Nine is Zhao Liying's second collaboration with both William Chan and Lay Zhang, after Legend of Zu Mountain and Royal Treasure respectively.

[9] The scenes set in Zhang Qishan and Er Yuehong's mansion were filmed in Hengdian World Studios, in Dongyang, Zhejiang province.

Following the series, a wax figure dressed of Zhang Qishan (portrayed by William Chan) was added to Madame Tussauds Shanghai in April 2017.