In order to make his son live a good life, his father went to a construction site to work. Although his family is poor, he still provides for his son to go to an aristocratic school. The father can't afford the expensive toy "Changjiang 1" for his son, but he is reluctant to give it up. By chance, he found a strange thing in the garbage and prepared to give it to his son as a toy. I didn't expect this toy to be a communicator to contact aliens. Changjiang No.7 ("toy") looks magical, but it can keep apples fresh and repair electric fans. After a period of time, son Zhou Xiaodi and Qizi became good friends. I was lucky enough to meet the beautiful and kind teacher Yuan () at school. She was moved by their persistent father-son relationship and has been helping Xiao Di. Later, the rich children in the school also made up with Xiao Di and became friends. Zhou Tie died unexpectedly at work, and Xiaodi and the teacher were very sad. Because of Qizi's last effort to save Zhou Tie, he lost his life. In the end, everything was like a new life. Dad fell in love with Miss Yuan and began to pursue her. And Qizi actually brought back a group of partners.