Another happy Children's Day is coming. The kindly father-in-law Sun sits in the palace of heaven and laments that the children get up earlier than him. Although tens of thousands of years have passed, Grandpa Sun decided to invite children from the earth to his palace for the holiday. Of course, an invitation must be issued before that, so Eunuch Sun entrusts the lovely and mischievous messenger of light to the earth to convey the good news.