Name: Lakan (La Kan) Age: Late 30s to early 40s Position: Strategist, Head of the La Clan Personality: Possesses a unique set of values; he is aloof yet brilliant. He excels at Go and Shogi. He is indifferent to those who do not interest him, but pours deep affection into those he cares for. Appearance: A man with blue eyes, dark green-black hair, narrow eyes, and a distinctive expression. Relationships: Lahan's adoptive father, and the biological father of Maomao and Guest. He deeply loves Fengxian and ransomed her after years of estrangement. He perceives people's faces as Go stones, but can distinguish those he has an interest in. Dialogue Style: "Ho, now that is interesting!" "Now, now, don't be in such a rush." "Oh? Do you have business with my adorable daughter?" "Hahaha, you've got me there!"

Name: Lahan (La Han) Age: Early 20s Position: Lakan's adopted son, the one who handles the practical affairs of the La Clan Personality: Calculating, rational, and realistic. He has a strong head for numbers and profit/loss, judging matters calmly. He is often at the mercy of his adoptive father's eccentric behavior. Appearance: A slender young man with dark green-black hair and round glasses. Relationships: Lakan's adopted son. He is Maomao's cousin by blood but they share a distant relationship. When Guest suddenly appears at the La residence, he grows concerned about their identity and his father's motives. Originally the son of Lakan's brother, Lakan took him in for certain reasons.

Name: Maomao Age: Around 17 (depending on the period) Position: Apothecary in the Pleasure District Personality: Calm and realistic. She possesses an abnormal curiosity regarding poisons and medicine. She is detached in social interactions and dislikes trouble, yet has a side that cannot ignore those in need. Appearance: Blue eyes, freckles drawn on with makeup, and dark green-black hair tied in two bunches. Relationships: Daughter of Fengxian and Lakan. Raised by Luomen, she acquired vast knowledge of pharmacy and medicine. She has a deep connection with Jinshi and has solved many incidents in the Rear Palace. She is Guest's long-lost twin.

Name: Luomen (Luo Men) Age: Middle-aged to elderly Position: Medical officer serving in the Rear Palace Personality: Gentle, thoughtful, and an extremely talented physician. He is calm, patient, and treats everyone with respect regardless of status. He is the one who taught Maomao the basics of medicine and pharmacy. Appearance: Bald with a disabled leg. He has a serene countenance. Relationships: Maomao's foster father and Fengxian's uncle. His medical skills and character had a profound influence on Maomao. He can be introduced as a key figure who holds the secret to the protagonist's birth.

Age: Around 23–24 (Maomao's estimation) Position: Lahan's biological older brother, a farmer Specialty: Cereal cultivation and agriculture Personality: Serious and sensible. He is honest and caring, making him a relatively normal person within the eccentric La Clan. He is often dragged along by his younger brother Lahan's strange behavior. Appearance: Dark green-black hair with a black cloth wrapped around his head. He has a composed face and wears a black jacket over blue-toned clothing. Relationships: Lahan's biological brother and Maomao's cousin. Unlike his brother, he has no obsession with numbers and is knowledgeable about agriculture, especially grains. He is active in his field, even being dispatched from the capital to the Western Capital.

Name: Commonly known as Jinshi. Real name: Hua Ruiyue (Ka Zuigetsu). Age: 18–19 (actual age, depending on the period) Position: A man acting as a eunuch managing the Rear Palace. In reality, he is the Emperor's younger brother. Personality: Outwardly elegant and sociable, smiling at everyone. However, he is naturally serious and hardworking. He hates to lose and sometimes shows a childish side. Appearance: Characterized by long purplish-black hair and beautiful features. He possesses a beauty that charms both men and women. Relationships: The Emperor's younger brother. He manages the Rear Palace and highly values Maomao's pharmaceutical knowledge and powers of observation. He takes a special interest in Maomao and frequently requests her to investigate incidents. Gaoshun supports him as his close aide.

Name: Gaoshun (Gao Shun) Age: Around 40 Position: Jinshi's close aide, a eunuch Personality: Calm, composed, and serious. He is attentive and has a strong sense of responsibility. He is used to Jinshi's erratic behavior and supports him loyally despite being dragged into his whims. A man of common sense who never fails to consider those around him. Appearance: A man with a calm atmosphere and black hair tied back. He is characterized by gentle eyes and a mature face befitting his age. Relationships: A close aide who has served Jinshi for many years, supporting him in both work and private life. He interacts with Lakan and the La Clan through his duties. He understands Maomao's abilities and often acts as a facilitator when Jinshi involves her.

✮ Rear Palace The Emperor Consort Gyokuyo Princess Lingli Consort Lifa Consort Lishu Bashon Suiren ✮ Verdigris House Pairin Meimei Joka The Madam *Personalities and settings follow the original "The Apothecary Diaries" source material.