There is a profession that has never been known to anyone in history. They use people as containers for medicine and use people to refine medicine.
The person who refines medicine is the dark medicine master. They believe that human beings are the best tonics and can be refined into medicines through special methods, which can lead to immortality.
Where there is black, there is also white. The white pharmacist deliberately turns into a person who can easily be made into medicine to attract the dark pharmacist and eliminate harm for the people.
There are also medicine thieves who do not want to wait for a long time, so they rob people who have developed medicines from secret pharmacists.
These three factions are constantly fighting, but they jointly keep the secret of making human medicine. In daily life, they all have other identities that can be seen in the light.
Concept: Stories of various medicines