After being kidnapped and forced to work as a servant in the rear palace, former apothecary Maomao inadvertently draws the attention of the higher ranks when she investigates what's causing the emperor's infant heirs to fall mysteriously ill.

Maomao does her best to navigate the complex social situations at the garden party, including meeting the other Upper First rank concubines. But once she settles down to do her work as a food-taster, she discovers a surprise in a bowl of soup.

Maomao's peaceful morning at home is interrupted when she's called in to investigate an apparent double suicide at one of the local brothels.

An older acquaintance of Jinshi's dies while drinking at a party. A servant's body turns up in a moat. Both deaths are written off as self-inflicted, but Maomao's keen observations tell her that there's more to both stories.

Maomao confronts Fengming about the dark secret she's been hiding from her noble Lady Ah-Duo.

Ah-Duo's replacement has arrived in the rear palace, and Maomao is assigned to give a certain lecture to all four high concubines. Later, Maomao helps Lihaku investigate a warehouse explosion.

Gaoshun requests Maomao's help in solving an apparent poisoning case. Meanwhile, Jinshi deals with an unwelcome visitor who's taken to lingering in his office.

A shack, a chest of drawers, and a fishbowl are all that a talented metalworker leaves to his three sons upon his death. Maomao is assigned to investigate how these strange inheritances all fit together.

Back at home, Maomao visits an annex building at the Verdigris House that hides one of the brothel's secrets. Lakan continues to antagonize Jinshi as his connection to Maomao becomes clear.

Maomao was able to stop the assassination attempt, but was heavily injured in the process. However, the injuries aren't enough to stop her curiosity, driving her to confront the culprit behind the incident.

Lakan must now choose a courtesan to buy out. As a high-ranking military official, he can afford to freely choose, even from one of the Three Princesses. Who will he choose? Who does Maomao really want him to choose?