Bai Li, the most unruly daughter of the Nine-tailed Fox Clan in Qingqiu, sneaked into the world under the pseudonym "A Li" in order to escape the marriage arranged by her clan. However, when she first entered the mortal world, she accidentally ran into Shen Yan, a young monk who was charged with the "Demon Slaying Order". One is a wild fox who regards the rules of the world as nothing, and the other is a Taoist rookie who abides by the "different path for humans and monsters". They should be natural enemies at war with each other, but due to a sudden mistake, they are involved in the ancient secrets related to the balance between the human world and the demon world.
Bai Li first entered the mortal world, ignorant but curious about human love. She made countless jokes when she tasted fireworks, but she also caught a glimpse of the softness deep in the human heart in the smoke of fireworks in the streets. She would share a piece of cake for a beggar on the street, and would protect an injured homing pigeon from a vicious dog. These "kindnesses that demons should not have" in Shen Yan's eyes gradually shook his obsession with slaying demons. Beneath Shen Yan's seemingly rigid appearance, there is an unknown past: his sect was once framed for protecting the demon clan. He was the only one who survived with the secret of the "Demon Slaying Order" and shouldered the heavy responsibility of clearing his sect's name.
As the two were forced to go together, they discovered that the frequent strange disasters in the world were actually related to an unfinished "Mortal Tribulation" three hundred years ago. It is said that if the fox clan had true love in the world, it would trigger the "Mortal Tribulation." Three hundred years ago, it was Shen Yan's master and Bai Li's aunt who were separated forever due to this disaster, leaving hidden dangers that could subvert the two worlds.
Bai Li's nine tails will be revealed uncontrollably when she is emotional, and Shen Yan's "Demon Killing Order"
