The interaction between father and son was demonstrated through dialogue, revealing Guan Xiao's dissatisfaction with his father's educational methods. On the day of the Sports Festival, Ping Pong and his two brothers wore small yellow hats to school, which aroused Guan Xiaozheng's curiosity. Guan Xiaozheng was trying to distinguish between the two brothers, but Pong Pong's mole seemed to be different. In the classroom, students and teachers expressed doubts about the behavior of table tennis wearing hats, and the table tennis player insisted that he had a serious cold. Although the medical examination showed that he did not have a fever, Ping Ping insisted that he had a severe cold, and the teacher decided to contact the parents. Table tennis, on the other hand, insists that they will recover during the competition, citing the sports festival as an excuse. The entire chapter showcases the friendships between teenagers and the small incidents in school life through a series of events.

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It tells the story of Ping Pong's unexpected victory in the 50 meter sprint race, which surprised his classmates and aroused suspicion from Guan Xiaozheng. During the competition, Ping Pong wears a small yellow hat and runs slower than Ping Pong, which is inconsistent with his previous sprint performance. Guan Xiaozheng noticed these abnormalities and decided to observe them secretly. After the competition, Pong Pong claimed to have achieved good results through daily exercise. However, two bangs appeared at the award ceremony, one wearing a small yellow hat and the other not. The two of them argued on stage, and eventually Pong Pong, who was wearing a hat, hurriedly left. Teacher Dai is also confused about this situation. After receiving the award, the mole on Pong Pong's face turned black, causing ridicule from his classmates. Pong Pong and Pong Pong then returned to the teaching building together, and Pong Pong cleaned the "black mole" on his face in the bathroom. Guan Xiaozheng followed the two and heard their conversation, realizing that the real champion was Ping Pong, not Pong Pong. Their plan was discovered by Guan Xiaozheng, but the classmates did not notice.