In the ancient country of Wuxiu, which has been lost in the annals of history, time overflows like water. Xuanheng, a lonely star diviner, spends day and night in front of the Mirror of All Things, searching for the reason for the disappearance of his homeland. In dreams, there are often silent golden crows flying across the ruins, carrying whispers of the bygone dynasty. He wanted to indulge in the afterimages of time, but was awakened by the echo of the mysterious bronze instrument - according to legend, playing this sound can reverse the fate of the vast river. Xuanheng stepped into the ruins and embarked on a journey to recover the lost civilization. He not only revived the lost memories of his tribe, but also unlocked the shackles of his own soul. However, the dust of history is not harmless, and behind the forgetfulness lies the imminent disaster. The lingering sound of the piano, the afterimage of the stars, the silent watch and the endless longing are intertwined into an elegy about remembering and exile. Can Xuanheng make his own echo among the ruins and turn forgetfulness into new life?