In this chapter, we are introduced to a new character, chenguang, a student at a famous high school in Shanghai. He explains that he has come up with a solution to solve the problem of "fairness incorruptible" . The ground has been divided into two groups of seven people each, and each group has to fill up a square with stones to complete the game. In the first round of the game, everyone can complete the walk with one foot, but only after everyone has completed the round can the next round begin. After everyone has finished the round, they will be able to prove their innocence by fighting in the next square. .