The Apothecary Diaries

In the East is a land ruled by an emperor, whose consorts and serving women live in a sprawling complex known as the hougong, the rear palace. Maomao, an unassuming girl raised in an unassuming town by her apothecary father, never imagined the rear palace would have anything to do with her—until she was kidnapped and sold into service there.
Though she looks ordinary, Maomao has a quick wit, a sharp mind, and an extensive knowledge of medicine. That's her secret, until she encounters a resident of the palace at least as perceptive as she is: the head eunuch, Jinshi. He sees through Maomao's façade and makes her a lady-in-waiting to none other than the Emperor's favorite consort... so she can taste the lady's food for poison! 

(Source: J-Novel Club)

In the imperial court, a young woman is put into servitude, Maomao. The tale is just beginning for the woman doctor/pharmacist from the red-light district, as rumors circulate about the emperor's children's lives being short-lived. Her curious nature and thirst for knowledge pushes her to action. To satisfy her curiosity, this young doctor/pharmacist will investigate the origin! What is shifting in the imperial court..!? 

(Source: Square Enix Asia)