During the three hundred years of Ningguo's calendar, the royal family controlled the country's destiny with its supreme domineering power, and Longhu Mountain used Xuanmen Taoism to stabilize the world. However, in recent years, mysterious cases have occurred frequently, the deaths are mysterious, the fate of the dynasty is like a dark cloud, and the shadow of the red dragon is looming and struggling.
The old Heavenly Master of Longhu Mountain watched the sky at night and knew that the doom had come, so he summoned his disciple Long Xuan from the gate, gave him a secret decree, and sent him down the mountain. This young real man with a mahogany sword on his back and a sincere heart stepped into the prosperous and crisis-ridden capital city with the mission of investigating mysterious cases and discovering the truth about the decline of his master's sect.
He thought he only needed to exorcise evil spirits and slay demons, but he did not expect that what awaited him was the emperor's reliance and temptation, the wooing and plotting of powerful officials, the betrayal and competition of his fellow disciples, and the Netherworld cult lurking in the shadows, intent on subverting everything. The pure Taoist heart is tested in the whirlpool of lust for power and conspiracy. The peach wood sword in his hand must not only slay the demons and monsters, but also split the heavy fog shrouding the dynasty.
When Dao and law meet domineering, when innocence meets machination, will this little real person who comes down from the mountain become a pawn of power, or will he become the chess player who brings order to chaos and reshapes the world? For whom will the thunder over Longhu Mountain finally ring?