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The ordinary life of high school sophomore Zhao Feng was completely shattered by a taboo piano in the basement of his home. Uncle Jiang, who was living there, was guarding the piano that was engraved with butterfly patterns. But driven by curiosity, the moment Zhao Feng pressed the keys, the butterfly patterns on the piano body lit up, and the shadow of an island in the sky appeared on the wall - it was the "Butterfly Cloud Island" that he had never heard of. In order to find the necklace, Zhao Feng stepped into the old house left by his grandmother and found the other half of the butterfly soul chain in the gramophone. But the pursuit of the Dark Butterfly Clan (descendants of the tyrants of the Tong Dynasty) followed one after another. Uncle Jiang was hit by a poisonous arrow to protect him. Before his death, he told him: "When you are fifteen, use your necklace to open the piano door and go to Dieyun Island to find Elder Xuan." Passing through the light door opened by the piano keys, Zhao Feng arrived at the Dieyun Island floating on the golden sea, only to see that the island collapsed and the sea water overflowed the embankments. The invasion of the Dark Butterflies three years ago destroyed the "floating island core" that kept the island afloat. After the death of the Butterfly Emperor, the islanders were facing annihilation. As the only bloodline of the Butterfly Emperor, he was pushed to the position of temporary Butterfly Emperor, shouldering the mission of repairing the core and protecting the two realms. On Dieyun Island, he discovered the power of the piano's "dual world linkage": the human piano and the "mother piano" on the island have the same origin, and can both transmit images and resonate for defense. But Baolie, the leader of the Dark Butterfly Clan, has always been watching with eager eyes. He not only snatches the core fragments, but also plans a "double realm raid" in an attempt to destroy two pianos at the same time and cut off the passage. In order to save Dieyun Island and protect relatives and friends in the world, Zhao Feng led the islanders to sneak into the dangerous misty trench to find the core...