In 1936, Song Zhiwei, a piano student at the Jinling Women's Conservatory of Music, was looking for "Moonlight" that no one was playing in the piano room late at night, and met the ghost of Xie Changqing, a senior who died in the anti-Japanese war seven years ago. Although people and ghosts are on different paths, she is willing to help him piece together the unfinished music. Between the black and white piano keys and the moonlight of the Republic of China, the two gradually develop a deep love that transcends yin and yang.
As fragments of the score were recovered and testimonies of old friends emerged, the truth behind Xie Changqing's death was gradually revealed - it was not an accident, but he was betrayed for delivering anti-Japanese information. When the injustice was over, his soul gradually dissipated, and the two had no choice but to rush to compose the final chapter, express their feelings through music, and express their separation and care. Many years later, the old story has been repeated, and the figures in the reincarnations have touched each other, as if the agreement in the previous life has been renewed.
