The narrator is waiting for the teacher of class A to arrive. He hears that the new teacher is "about 190 centimeters tall" and that his arm is "like a gorilla" . The narrator asks the students not to stare at him, as he will be helping Miss Lu with class matters during his absence. He tells the students that he has an announcement for them, but he does not know how to explain it. He says that the class is hard, and that the teacher is stressed out because he is an intern. The students seem interested in the teacher, and he tells them that he will start teaching in class G from today on. He will replace his math teacher in a few days, and the students are excited to meet him. They ask the narrator if he checked on the hot search, as compared to class A, class G is "more chaotic" , and this teacher seems to like their class so much. The class is noisy when he is giving lessons, and even if he is in deadly earnest, there is still no one in the class listening to what he is saying . He asks Siyu to tell the teacher not to discipline class G while being polite, and Siyu says that everyone knows that they are not difficult students, but they are different from the teacher. Siyu tells the narrator that he needs to have fun and make the students happy, because the teacher "matters how lame" he is.