Children travel to the future with the help of Geumbi, the fairy godmother, only to witness a desperate world where everyone has turned to stone, not the brilliant future they expected. In a world overrun by demons, Hari and her friends barely return to reality. Just then, Leon appears with the prophecy of the Opikion and warns the children. Meanwhile, an incident occurs where all the children of Starlight Elementary School fall into a deep sleep...