Through a series of events, it showcases the activities and conflicts of teenagers in the community. Li Pingping and his cycling teammates switched to playing basketball because they couldn't play "Cloud Battlefield", but they still couldn't forget about cycling in their hearts. Li Pingping performed well on the bicycle and was praised by his teammates. Subsequently, they engaged in a water bomb shootout and accidentally injured Little Stone's father, triggering a conflict. Little Stone's father is worried about the safety of the children, while Li Pingping feels resentful. During a dispute, Little Stone's father accidentally fell into the mud and water, and Li Pingping took the opportunity to escape. Afterwards, Li Pingping's bicycle valve core was pulled out, and he suspected that it was Little Stone's father, but the latter denied it. Guan Xiaozheng offered to help, but later accidentally discovered a valve core in the washing machine, raising questions about the truth of the incident. The entire chapter explores the boundary issues between the use of community shared spaces and adolescent behavior through children's interactions and conflicts.