The Ji Family had an ancestor during the previous dynasty who was known for his ruthlessness as a minor official.
At that time, a tyrant rose to power, and the ancestor caught the tyrant's eye, who promoted him to inflict wrongful imprisonments on a large scale. The number of people he had killed was beyond tally.
Of course, this ancestor met with no good end.
However, he did manage to save his two sons and recorded his extensive experience in running prisons over the years for his sons to take when they fled.
These two sons lived incognito in the countryside. After the passing of the tyrant and the arrival of peaceful times, they came out and became secretaries who managed various types of cases.
