Summer vacation. Shi Xiaofei, a boy in the first grade of junior high school in Kunming who entered the rebellious period, had a quarrel with his family, ran away from home secretly, and boarded a train bound for Lijiang with a thousand yuan stolen from home. In Lijiang, Shi Xiaofei, who could not swim, accidentally fell into the river and was rescued by Wang Cheng, a boy who was two years older than him. After being sent to his home, Shi Xiaofei told the story of running away from home. Wang Cheng is in the third grade of junior high school and is studying very well. His parents go out to work, and he and his sister are the only ones at home. Wang Cheng asked Shi Xiaofei to stay in his home. Everything here made Shi Xiaofei, who came from the big city, full of curiosity. A new journey began...