The narrator and his sister are in the city of Yongfang. They go to the zoo to see a rare bird. The narrator tells his sister that he's accepted into the university and is waiting until he decides on a major to study in cooking. He tells her to clean up early so he can cook for her. The students are waiting outside the gate of the university for the exam to begin. Su mu and her sister go to see the street food, but they don't hurry to get to the university because they want to check out the food. Su tells her sister that she's heard that the meat tastes spicy, good with vine pepper, and that she should eat it. She tells him that he should clean up before the exam starts so he won't have to worry about it later. She also tells him to get ready to go to bed early because it's time to take the exam. Su says that the closer to 9 o'clock the higher the number of students waiting outside. She says that she just brought 30 boxes of shang-fu chicken, which are recommended as a snack for the students. She's sure that the students who buy the boxes will recognize the food by now. Su also tells her that the value of the food will increase each time the price goes up. He says that each time he brings a box of food, the value goes up by one point. He also says that every time he sells a box, the significance of the sale goes up one point, too. He asks the students to give him