The Spirit Suppressing Realm, the southern region under the control of the Bone-Soul Sect.
Demon Saber Kuang Weiping had been assigned to create a Dark Hall within the Devil's Gate since he was discovered by the Demon Child Elder in the border region of Chengde Dynasty, practicing Demon Sect Secret Manual, using devil cultivators as resources, refining them into human pills, and devouring them for cultivation.
However, before he could reach his destination, another fellow Daoist appeared out of the blue: Unchanging Bone Jiang Mingda, who turned out to be a formal disciple of the Wanyu Immortal Sect.
After their encounter and brief understanding of each other's situations, they decided to proceed together upon realizing they both were tasked with forming the Dark Hall.
After all, neither of them knew much about the Demon Gate, and both were feeling apprehensive.