Kusuriya no Hitorigoto is a Manga/Manhwa/Manhua in english language, Romance series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

In the imperial court, a young woman is put into servitude, Maomao. The tale is just beginning for the woman 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 pharmacist will investigate the origin! What is shifting in the imperial court..!?