My surname is Gu, and everyone calls me Gu San. I run a drug store called "Caolu" by myself, and we only sell one kind of medicine, which is the unique regret medicine.
It only takes one pill of this medicine to change your life. The price is not discussed when selling the medicine. The price will be automatically deducted after taking it. Of course, I can't be sure what is being deducted. Maybe it's money, maybe it's power, maybe it's your lifespan.
The current tentative chapter: Zhuma x Qingmei (in progress)
Apprentice x Master (to be continued)