From the perspective of Lin Qiusi, a series of interactions between members of the reasoning association at Handong Middle School in the activity room and office were described. In the activity room, Tan Juanjuan, Du Shushu, and You Wenrui staged a scene of emotional entanglement. Tan Juanjuan blushed after receiving a text message from a certain boy, and Du Shushu misunderstood and tried to refuse on her behalf, causing Tan Juanjuan's dissatisfaction. Zeng Shuai's appearance interrupted their farce and reminded them to pay attention to school discipline. Subsequently, the group moved to the office where Zeng Shuai presided over an internal meeting on the operation and future development of the association. The content was dull and left the members present feeling bored. Lin Qiusi and other members showed varying degrees of impatience during the meeting, and the entire scene was filled with youthful vitality and the tense atmosphere of detective games.