In the story recounted by Zhu Shijie, upon hearing their group's discussion, Yan Sijia casually remarked, "You are all over sixteen now, old enough to be jailed."
Though they were somewhat like hoodlums at school, their mischief never reached a level warranting imprisonment.
What shocked everyone was that Yan Sijia then suggested joining the scheme to extort twenty thousand from Lu Yuzhen, to be split five ways.
They all agreed.
After all, their share of the money was substantial enough to greatly reduce the risk, so why not?
Thus, they collaborated to produce a fake video, handed it to Lu Yuzhen, and smoothly obtained the twenty thousand.
As for what happened later, Zhu Shijie didn't know.
He only knew that he had been extremely uneasy for a long time after the incident.
It was only when no one came looking for trouble for a long time that he finally relaxed.
However, he hadn't expected that, eight years later, someone would come to bring up the past again.