Every night after falling asleep, Bi will be adventured into the dream world with her two friends, Bo and Tin. In this dream world, there are no adults, vehicles, or factories, so there is no pollution. Children are immersed in a world full of trees called Magical Forest. 

In this world all plants have sentience. Children play with plants like friends. Play swing, jump over the soft mushrooms, slide the slide with leaves. While playing, Bi accidentally fell and was saved by a tree. At the same time, the glow seeds from the trees in the magical forest suddenly flew up and then flew to the same side of the Mother Earth tree, the tall tree glowing in the center of the forest. Mother earth trees show children a perspective of the future world when there are no more trees because of human impact. 

The children sympathize with the natural world and together plant trees with magical seeds to save the world.