Mei Seventeen, a junior guard girl from the Yu Dynasty's Hidden Guard Department, yearns to achieve marital autonomy and freedom through promotion and salary increase. A mysterious homicide occurred in the palace, and the emperor's concubine died. Emperor Yu ordered the Hidden Health Bureau and the Supervision Department to investigate cases separately.During the investigation process, Mei Seventeen encountered the cunning and vicious Chief Inspector Leng Moyan. The two of them were suspicious of each other, causing them to stumble and creating many exciting and thrilling conflicts. After encountering multiple timesAfter the frontline of life and death and mutual support, they gradually began to trust each other. The two of them work together sincerely to investigate the true culprits of crimes that endanger national security and national security, and engage in a battle of wits and courage with the mastermind behind the scenesLove kills each other, ultimately confirming that the other person is the true love of one's life.