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.

The caravan stirs up excitement in the inner palace. The merchants bring all kinds of goods. However, something gives Maomao a bad feeling.

The woman from the clinic finds out that Maomao knows a thing or two about medicine, and asks for her help.