In this chapter, we learn that Fang's family has adopted a boy who is the illegitimate son of a concubine. Fang is furious that his parents have adopted a son who is not his own. He tells his sister that he will not be able to marry her until he has passed the "test of princess Yuzhen" . He also tells her that he has just learned that the mission of the fanyuns has left the city. He is worried that the secret letter could be evidence that Fang is collaborating with the enemy. He decides to go to get the letter