Qingcheng used pharmacological knowledge and led to the fact that Alai took “ water plant ”.Lu Gengyun proposed an autopsy, and Qingcheng excreted the powder of broken water plants through the steamed bone autopsy, and Lu Gengyun took out the blood containing deer blood in Tianxianglou.The two teamed up to connect key evidence through the theory of food restraint to restore the truth.

Sun Pingkang was acquitted.Lu Gengyun was entertained by the Sun's mansion, and Qingcheng said that he had broken through three door walls of the royal palace and asked for help from Princess Ning.At this time, Qiansi and the Blue-Eyed Fox stared outside the Sun Mansion, planning a new conspiracy. The Blue-Eyed Fox recalled the Black Festival Grass incident half a month ago.
The emperor's birthday is approaching, but the tribute black festival grass disappeared out of thin air.The officers and soldiers used clues to lock up Gu Qingcheng as a thief in the flower collection, surrounded and suppressed Sun's mansion, and found the destroyed black grass.In order not to implicate others, Qingcheng promised to be rescued within three days. If she broke her promise, she would bear all the punishment alone.Qingcheng studied the treatment method day and night, and Lu Gengyun secretly checked the bite marks of the black festival grass and found clues.