The Shen family, a prominent family in the south of the Yangtze River, was wiped out overnight. Only the young master Shen Jingchan managed to escape. In the light of the fire, he witnessed his relatives fall under the knife of the bronze masked man. The half-piece of wooden sign with cloud patterns that his father gave him before his death became his only clue to find the truth.
On the way to escape, Shen Jingchan encounters the mysterious woman Su Wanying. Wearing a black cloak, with a dagger glowing with cold light hanging from her waist, she claims to be a descendant of the "Tianji Pavilion" and knows the man behind the Shen family's destruction - the Nether Sect, which is feared in the world. The purpose of the Nether Sect's massacre of the Shen family was precisely to seize the "Tiangong Kaiwu" manuscript that the Shen family had guarded for generations. That strange book that recorded peerless mechanical techniques and the secrets of creation was enough to overturn the structure of the martial arts world.
One is a down-and-out young man with a blood feud, and the other is a heroine with a mysterious mission. The two form an alliance because of their common enemy. They sneaked into the popular Yunqi Temple and explored the Shen family's secret room under the Buddha statue in the Tibetan Scripture Pavilion; they traveled through the Broken Soul Valley where there were many agencies to avoid the pursuit of the Nether Sect; they circled between good and evil and uncovered dust-laden secrets one by one.
The cloud-patterned dagger in Shen Jingchan's hand and Su Wanying's Tianji Pavilion token hide a mystery. The incomplete patterns on the wooden sign seem to be closely related to the key to "Tiangong Kaiwu". When the cracks in the bronze mask gradually widened, and when the conspiracy of the Netherworld Sect came to light, they discovered that this feud spanning decades had already tightly entangled the fate of the two of them.
In the glint of swords and shadows, there is the obsession for revenge; in the misty rain in the south of the Yangtze River, there are ignorant emotions.
