Ice Lemon was born in 1995, and now it is 27 years old. The assistant of polyhedron. Quiet, kind, tearful girl, strong environmental awareness.

The play mainly tells the story that polyhedron, lotus seed buns and iced lemons help introverted and timid Ding Kaile overcome difficulties and become confident under the guidance of grandpa, an old urchin.

Lele, who is timid but smart and kind, is a fourth-grade primary school student. In his life, he has been living under the double pressure of school and family. He is experiencing the troubles and depression of his peers, and he is not happy at all in real life.

After experiencing an exciting and fun computer adventure, Lele traveled through time and space and accidentally entered the "happy planet" in the mystery of the vast universe, where she met three children and became friends. They brought a lot of strange "treasures" to Lele: memory bread, love chocolate, golden feathers, magic glasses, intelligent cactus, laser burglar alarm and vertigo instrument.

Even a robot mother or something. Lele has changed. Lele, who used to be timid, became confident. Lele, who was not interested in learning, has begun to feel the importance of knowledge and has the desire to learn like a polyhedron and engage in invention and creation.