At home at night, Lin Xi took out a gift and gave it to Lu Chi. He was very happy when he found out that it was his favorite racing car. At the dinner table, Jun Xing's father cooked a large table of meals, and asked about Lin Xi's future plans. Lin Xi said that she wanted to be admitted to Peking University. At night, Lu Chi and Jun Xing sent Lin Xi away. Lu Chi invited Lin Xi to watch his car race, and Jun Xing said he would go too. At this moment, Qin Kai appeared on a small electric donkey, and Lin Xi got into Qin Kai's car and went back to school with him.
On the way back, Qin Kai told Lin Xi about his family, so he wanted to take Lin Xi to see his grandfather. Qin Kai took Lin Xi to the boiler room of the school, and it turned out that this was Qin Kai's secret base. He took out a grass named "Libai" and introduced the plants he raised to Lin Xi. Qin Kai told Lin Xi that he liked flowers and plants because he was lonely when he was a child, and could only talk to the succulent plants in front of his house. Over time, he felt that plants were more reliable than people. Lin Xi wanted to leave after the visit, but Qin Kai wanted to stay here and not go back to the dormitory, so Lin Xi agreed to help Qin Kai keep it a secret.
The next day, Director Xie came to the boiler room angrily because there was no hot water in the shower room, and found Qin Kai's secret base, and saw Qin Kai sleeping on the sofa.
In the classroom, Jun Xing was helping Lu Chi refit the race car when he heard the criticism and punishment of Qin Kai on the radio. In the office, Director Xie told Qin Kai that this matter should be dealt with seriously, and asked his parents to come to the school next Monday, otherwise Qin Kai would be expelled. Listening to Director Xie's firm words, Qin Kai went to the playground to contact his father, but was told by the secretary that the meeting was not over yet. Qin Kai comforted Lin Xi who came to care about him, but walked slowly back to the classroom alone. Under the narration of "Da Hei Niu", Lin Xicai really understood Qin Kai's family situation.
In the classroom, Lin Xi told the matter to several members of the team, intending to ask them to lend a mother to Qin Kai, but they could only politely refuse due to various circumstances, and in the end only Jun Xing was left. Junxing didn't understand why he wanted to help Qin Kai and left his seat. Lin Xi caught up with Junxing and told him that Qin Kai's mother had passed away.
When school was over, Junxing found Qin Kai and told him that he was going home to discuss with his mother. Qin Kai happily got on the back seat of the bicycle and went home with Junxing. When the two returned home, Aunt Junxing Lawen went to the side to discuss, and Qin Kai looked at the family photo of the four in the living room, thinking. At dinner, Aunt Wen promised to help Qin Kai, and comforted him very openly. Qin Kai looked at the happy atmosphere of the Junxing family and was very envious.
On Monday afternoon, Aunt Wen brought Qin Kai to Director Xie's office. Director Xie told Aunt Wen that the school was considering expelling Qin Kai, but at this moment she suddenly said that she was here to handle Qin Kai's withdrawal procedures, both Director Xie and Qin Kai were taken aback. Director Xie had no choice but to persuade Aunt Wen to let Qin Kai stay and continue studying, and asked her to care more about the physical and mental health of the child. Aunt Wen left her mobile phone number and left the office. Qin Kai chased out of the corridor, thanked Aunt Wen for her help, and made an appointment with her to eat dumplings at Jun Xing's house when she was free.
Lin Xijunxing was peeking at the warm scene of the two, suddenly remembered the agreement with Lu Chi, and hurried to the small park, but luckily he was not late. At this time, Wang Dong appeared with a few friends, and it turned out that Wang Dong was actually a little girl. After the race started, suddenly Wang Dong's racing car fell into the middle of the fountain. Seeing Wang Dong looking at the fountain sadly, Lu Chi asked Jun Xing for help. After Jun Xing and Lin Xi ran to the fountain to pick up the car, they couldn't help playing with the water. Wang Dong thanked the two for their help, and Lu Chi decided to help her fix the flooded racing car, so the two became friends.
Qin Kai had just talked to Lin Xi about Director Xie on the phone, but unexpectedly met him immediately. The two came to the barbecue restaurant, and Director Xie asked Qin Kai where he went after school, weekends, and his usual meals. Only then did Director Xie know that although Qin Kai was not short of living expenses, his life was very casual because no one cared for him. Director Xie saved Qin Kai's mobile phone number, and told Qin Kai that he would hold a parent-teacher meeting for him in the future. Qin Kai looked at Director Xie and was moved to tears.