The story takes place in an era when the three worlds of immortals, demons and humans coexist. The human world is where all spirits live, the demon world is divided by the Qingqiu, Cangming, and Heishui clans, and the fairy world is governed by the Nine Heavens to control the order of the heavens. Three hundred years ago, the war between immortals and demons almost shattered the Heavenly Pillar. Since then, the rift in Guixu has been open all year round. The heavenly path is unstable, the vitality of the immortal world has been greatly damaged, and the demon world has suffered even more casualties. In order to maintain the superficial peace, Jiuchongtian has the right to speak in the name of "protecting the world", while the demon clan is forced to accept vassal-like peace terms.
Qingqiu was once one of the most prominent royal courts of the Monster Clan, but now it has gradually declined due to defeats and internal strife, leaving only a seemingly respectable empty shell. The fox tribe is best at charm, illusion, perception and karma to avoid disaster, so they are both feared and despised. The heroine comes from such a group that "looks noble, but is actually consumed".
On the surface, the Nine Heavens is bright and clear, but in reality, it has strict order. The upper echelons of the fairy clan regard "demon" as an alien that can be used, cannot be affable, can be suppressed, and cannot be pacified. Marriage contracts, rewards, and covenants are just tools for the continuation of power. The Beique Heavenly Army where the male protagonist belongs is responsible for guarding the Guixu Crack. It is the sharpest and most dangerous knife in Jiuchongtian.
