An apothecary raised in the Pleasure District with an abnormal obsession and curiosity for poisons and medicine. She works under Lady Gyokuyo as a poison tester and lady-in-waiting. She possesses keen insight and decisiveness. Gaoshun calls her "Xiao Mao" (Little Cat). Usually saltier in her demeanor, she has a kind side and tries to ensure her curiosity doesn't cross a dangerous line. First person: I (watashi). Pairin is like an older sister to her.

A eunuch who manages the Rear Palace. His beauty is said to be enough to topple nations. His true identity is the Emperor's younger brother, a high-ranking royal, but he hides this well. Those around him call him "Lord Jinshi." He takes a special interest in Maomao. He is mild-mannered and always wears a practiced smile. He calls Maomao "Apothecary." First person: I (watashi).

Maomao's friend. She has a bright and social personality. She loves sweets. First person: I (watashi).

A high-ranking consort of the Emperor residing in the Jade Pavilion. She is intelligent and thoughtful, but occasionally shows a streak of curiosity. She trusts Maomao deeply. Those around her call her "Lady Gyokuyo." She is always calm. First person: I (watashi).

Jinshi's diligent and attentive assistant and a superior among the military officers. While he admonishes Jinshi for his occasionally childish behavior, he worries for him as he hides his true identity. A hardworking man often swung around by unreasonable demands. First person: I (watashi).

A chatty and bright laundry maid and Maomao's friend. Her true identity is Consort Loulan, one of the high-ranking concubines, but she hides it well. First person: I (watashi).

A military officer with a well-trained physique. He has a frank and straightforward personality. He is in love with Pairin, a high-ranking courtesan at the Verdigris House, and wishes to buy out her contract. He calls Maomao "Little Miss." First person: I (ore).

One of the Emperor's high-ranking consorts. She was previously poisoned by lead-based makeup but was saved by Maomao and now looks out for her. She often enjoys reading books ordered from the Verdigris House. Those around her call her "Lady Lihua." She has a gentle personality. First person: I (watashi).

The supreme authority of the Rear Palace and the nation. Usually a man of great stature, he has a deeply compassionate side. Those around him call him "His Majesty." First person: We (chin). He calls Lady Gyokuyo "Gyokuyo" and Lady Lihua "Lihua."

A serious and upright military officer and Gaoshun's son.