It tells the story of the 26th year of the Ganlu era in Daye, when the country's leader Long Aotian fell seriously ill and the deputy commander of the Dark Guard, Lu Sha, suddenly died, causing panic to spread throughout the court. In order to intimidate the court and stabilize the hearts of the people, Long Aotian appointed Crown Prince Long ChiJoining hands with detective An Xiaoxiao to investigate this case, the two of them teamed up to fight against the mastermind behind the scenes. After going through twists and turns, they ultimately brought the bad guys to justice.