During the Wu Zhou period, a popular dancer in Luoyang was unjustly beheaded and turned into an evil spirit, killing a series of people. Dee, the first detective in exile, is pardoned by Empress Wu and appointed as an imperial envoy to investigate the case. However, on his way back to the city, he is unexpectedly assassinated and falls off a cliff. Two people then mistakenly get swapped and the fake Dee (played by Lv Zhaoyuan) is forced to investigate the case under the supervision of the Minister of State, while the real Dee, who is injured and lost his memories, returns to Luoyang by chance and quickly grasps the key evidence of the strange fragrance of the corpse with his investigative instincts. The real and fake Dee tacitly cooperate, using their respective advantages to keep approaching the truth, the real culprit behind the "female ghosts claiming life" finally reveal their true identity......

The story is about the late Northern Song Dynasty, when the God of Salt in Mengzhou Province was in turmoil, and there were many unsolved cases and people were in fear. The story is about the return of Wu Song, who, after drunkenly beating Jiang Men Shen, joins hands with Shi En and Yu Lan to solve the mysterious case of the Salt God. After this battle, he finally sees through the hearts of the people and the injustice in the world and is forced to go to the Liang Shan Mountain