In a corner of the bustling city, there lives an ordinary family of three. Big-headed son (voiced by Liu Chunyan), small-headed father (voiced by Dong Hao) and apron mother (voiced by Ju Ping). Big-headed son is innocent, naughty and cute. He is in kindergarten and always hopes to fly into the sky like an astronaut and travel the universe. However, his dream is not understood by his parents. His father perfunctorily asks him to go to space to fight monsters. His mother wonders why he wants to run so far, and whether he doesn't like the food his mother cooks. Big-headed son secretly makes a secret plan to become an excellent astronaut. Of course, mom and dad also have their own secrets. As an engineer, small-headed father is raising money with netizens to build a bridge for children in the mountains. Apron mother seems to be busy with housework, but she also has the so-called "Rainbow Plan". A loving family, each and together, works hard towards their dreams...