The story of children who communicate with all things in the world through their eccentric and fantastical imagination! They love all living things and grow up seriously. The story of the special world journey of the 4 Bubu siblings from the forest! In a forest Bubu village, Bubu To, a young Bubu who has not yet sprouted, spends his days exploring and learning about the world alongside his eldest brother Bubu Chi, his second brother Bubu Sin, and his youngest brother Bubu Bi, searching for the countless interesting things that exist around him. Sometimes he shows stubbornness and greed, but Bubu To is a good child who laughs and cries over small things, and sometimes argues with his friends from around the world during his adventures. Every time a small conflict arises in his heart, an angel and a devil, visible only to Bubu To, battle it out, but it is always the strong angel who wins. The subtle story teaches children to seriously ponder for themselves and find their own answers about what is right and wrong, rather than being taught unilaterally, so that they can develop their own standards of good and evil. Bubu To, along with his siblings, meets the animals of the forest, learns about them, goes to school, and travels, gradually learning the meaning of each thing through special experiences with everything around him. Soon, when the journey ends, Bubu To becomes a warm child who loves all things in the world with all his heart and knows their value.