The narrator tells us that he is the one who has invited his sister wanli to come to celebrate her brother's birthday. He says that he's going to treat everyone to a night snack so that they can make up for the fact that they're not going to be able to attend the party after the show. He's also going to make sure that his sister is changed so that she won't be angry with him when he asks her to come. Aww, that's a good plan. The narrator then tells us about how his sister rarely visits loong city and how he wants to spend time with her so that he can get her changed. He also says that his brother is really angry at him for asking his sister to come, and that he wants her to be changed so he can have some fun with her. He tells his brother that he used to think she was just a teenager, but now he realizes that she's just an adult. He apologizes for his negligence and says that after he comes to study at the university, he and his sister will go outside to sketch together. He