The first film has finished the story line. According to the query of Tencent Video APP, Ding Kaile is a guest star in Happy Planet 2, because the character has finished the story line after the first part, so there is no more plot to participate in the second part. The guest role is only to bring memories and surprises to the audience, not to participate in the whole story as the main character. "Happy Planet 2" tells the story of the old urchin grandfather of "Happy Planet", who believes that the children in "Happy Planet" have solved the problem of human knowledge inheritance through genetics, and they have profound scientific knowledge since they were born.