In this short scene, the third-grader is introduced to his teacher, who scolds him for being a bad kid. The teacher tells him that his big sister is obedient and good at communicating with people, but that he should be more like his little sister, who is a troublemaker and a standard for good children. He tells the class that he is the leader of a gang called "Duo duo," which patrols the hallways of the school. He says that he has four other members, including his older brother, who serves as the gang's leader. The girl tells the teacher that her brother, tianze, is a former coach on the school's football team, and that his hairstyle is identical to that of her older brother. She says that she has told the girl that it is too dangerous for her to walk on a wall like that, but the girl says that it was her brother's fault, not her sister's