Zhuiyang is a small city on the northern frontier. There are three types of people living in the city:
One type is the people who are native to Zhuiyang and have lived here for generations.
One type is the soldiers who have been stationed here to guard the border for many years.
There is also a category of family members of criminal officials who were exiled here.
One early morning in winter, with the north wind howling, thirty miles south of the city, a group of people were heading towards the direction of Zhuiyang City...