The nine families gather again! Surrounded by mysterious cases, Zhang Qishan is put into a difficult situation. Going all out to find the truth, he solves serial-killer cases with his adjutant!...

A must-see classic! Zhang Yixing, a member of EXO, works together with Zhao Liying and William Chan to present the drama based on the novel "The Mystic Nine" by Uncle Three! Zhang Qishan, an officer in charge of defense of the city, asks Er Yuehong, a connoisseur, for help to solve the mystery of the mine. What amazing things will happen later?...