The medical book Xiao Fengxing was reading was written by a wandering doctor.
He had once visited Jin Country, discovered this herb, and wrote down the prescription.
The spies from Jin Country were captured, and their intentions were revealed.
Since Ganning is a crucial passage in the northwest, no matter where one goes, one must pass through Ganning.
Jin Country intended to spread infectious diseases from Ganning, hoping to infect the surrounding areas, eventually reaching the northwestern army.
Then, Jin Country could seize the opportunity to encroach on the borders of Great Xi.
But now, this plan has been disrupted by Xiao Chengyu and Fu Shinian.
The spy was also captured.
Xiao Chengyu wrote a letter and sent it urgently to the capital, delivering it to Emperor Jiawen.
Ganning City was thoroughly searched to ensure no foreign spies had infiltrated the city.
After this incident, Hu Pingcheng became even more cautious and prudent.
