At the beginning of the chapter, we are introduced to Professor Qiao, who is teaching a class on the relationship between waves and the laws of physics. We learn that he does not have a girlfriend and that he is afraid that he will not be able to answer a student's question about the subject of the lecture. He tells the students that they should not waste their opportunity to ask personal questions, but should come on as soon as possible, as he cannot think of a good question to ask.