In the old city of Miansha, where public performances are prohibited, young music supervisor Kaiden received an old playbill left by his mother. There was only one address and one sentence on it: Go listen to the silent piano. At midnight on a rainy night, there was a sound from the building, and the whole city lost its sound at the same time. The opera house that had been dormant for many years came back to light. Arya, who has old memories but insists on using the name of her new life, goes with her from an abandoned theater and a station in the fog to the northern ruins to find out the truth about her mother's disappearance and the "Original Spectrum Project". They have also chosen to learn eternity again and again, looking for their own answers between protection, freedom and love.
