Yang Huaixi knew very well that guarding his family's secrets was as vital as guarding his own life.
Once outsiders figured out the tricks of medicine-making, not to mention how unscrupulous competitors would stop at nothing to fight for the secret recipe, just the authorities alone—if they caught wind of it and followed the trail—would spell absolute disaster for the two brothers.
This rule was both a mutual protection and a necessary law for survival in this perilous underworld.
Chapter 601