A scholar with a criminal record who could not take the scientific examination relied on the "examination arsenal" of a doctor of history to teach the cowherd boy Jieyuan and the son of a merchant to become a Jinshi.
He asked the children from poor families to use test papers to pry open the door of the imperial examination monopolized by aristocratic families. At the same time, he wrote his unjust case into a chain of evidence and hid it in the students' answer sheets.
When the emperor asked about his master's inheritance, he replied: Gu Yan, the guilty minister, has peaches and plums all over the world.
