When his parents went to work in the city, his grandfather took care of Kaikai, who was nine years old, to go to school and live. Kaikai picked up a stray dog and named it Xiaodan. Xiaodan was very timid and didn't dare to bark. His grandfather thought it was a dumb dog. Xiaodan was very smart. He would do whatever Kaikai asked him to do. He would follow Kaikai wherever he went, for fear that he would get lost again. Xiaodan became Kaikai's best friend. His grandfather had pulmonary heart disease, which ruined the family's finances. In order to pay for the medicine, he even stopped paying the cable TV fee. Kaikai had nothing to do during school. His grandfather was afraid that Kaikai would feel empty, so he coaxed Kaikai to read the text. He read today's lesson, consolidated yesterday's lesson, and previewed tomorrow's lesson. His grandfather didn't care whether Kaikai read right or wrong, as long as he could give Kaikai something to do. Every time Kaikai read, Xiaodan would be very supportive and sit on his grandfather's shoes to listen carefully. The teacher began to praise Kaikai, saying that Kaikai read well and wrote well, and that he would definitely be admitted to graduate school or even a doctoral student in the future. Kaikai studied harder. After finishing his studies, he studied extracurricular activities. After finishing Yue Fei, he studied Romance of the Three Kingdoms. One day, Xiaodan suddenly cried out and bit Kaikai's trouser legs to drag him into his grandfather's room. Kaikai ran over in a hurry, only to find that his grandfather was lying on the bed without breathing. Kaikai's parents came back to bury his grandfather and wanted to take Kaikai to the city. Kaikai didn't want to leave, saying that Wu Meifang from his class had been in the city for half a year and had not found a school, but had returned a few days ago. Kaikai wanted to study and didn't want to go to the city. Kaikai's father worked in the city and lived in a shed. His mother worked as a nanny in the city and lived in the employer's home. If Kaikai went to the city, he would have no place to live. The conditions for going to school in the city were too immature, but it was okay in the countryside. Kaikai learned to cook from his grandfather, and he could steam buns and roll noodles. Eating and dressing were not a problem. What worried Kaikai's parents the most was that if Kaikai got sick at night, there would be no one to know. So Kaikai's father went to find Kaikai's teacher. Teacher Wang said that Kaikai could eat by himself during the day and sleep at the teacher's house at night, and all the problems were solved. No one would say anything about leaving a nine-year-old child at home, and Kaikai's mother herself couldn't bear to leave. Kaikai's mother said, let's take the child away, or I will stay. Kaikai's father said, it's not that we don't want to take him, but he doesn't want to leave. Besides, learning is a lifelong matter. If this is delayed for the child, we will regret it for the rest of our lives. Kaikai's parents began to prepare all the daily necessities for Kaikai and explained them one by one, and quietly returned to the city one morning. Kaikai woke up and found that his parents were gone. He chased them to the entrance of the village and cried loudly, and began his own independent life. Without his grandfather, Kaikai was absent-minded when cooking, always burned the rice, and was always late for class. Later, Kaikai simply stopped cooking, and ate steamed buns with Xiaodaner, pickled vegetables and drank cold water. Teacher Wang had a big black dog named Dahei. When Kaikai took Xiaodan to sleep at Teacher Wang's house, Dahei kept barking, which scared Xiaodan so much that he hid under the bed and dared not come out. Kaikai felt sorry for Xiaodan, so he told the teacher that he couldn't sleep in another place and wanted to go home to sleep. With Teacher Wang's permission, Kaikai took Xiaodan home. Kaikai had a nightmare at night and woke up in fear. He called his father. His father asked Kaikai, "Aren't you sleeping at the teacher's house? Why are you back again? It's three o'clock in the morning. Why haven't you slept yet? Are you scared?" When his father asked, Kaikai cried. His father had no choice, so he spent some money to find some people to create the conditions for Kaikai to go to the city. Kaikai was going to the city. The night before going to the city, Kaikai emptied his schoolbag and put Xiaodan in it to try. It was just right. Kaikai said to Xiaodan, "I'm going to take you to the city. Are you happy?" The next morning, the father and son took Xiaodan to the bus station at the entrance of the village. When they were about to get on the bus, Dad suddenly said that he would not take Xiaodan with him and that he would buy him a better one in the city. Kaikai disagreed. Dad said that dog tickets were not sold on the train and people would not let people get on the train with dogs. Kaikai still disagreed. Dad got angry and said that Kaikai was disobedient. He pried Kaikai's hands apart, threw away the dog leash, and carried Kaikai on the bus. The bus started, and Kaikai resisted his father while crying and shouting for Xiaodan to run faster, saying that he was waiting for him in front. Xiaodan ran desperately to catch up with the car, but the farther he ran, the farther he got from the car.