When Shen Qinghe, an ancient book restorer, was cleaning up his grandmother's old house, he accidentally discovered a copper bell engraved with strange patterns. The moment the bell rang, fragments of broken time came flooding in - the brick alleys of the Republic of China, the woman in cheongsam leaning against the door with a smile, the blurred parting figures in the war, perfectly overlapped with her recurring dreams. As more old things bearing the mark of time were awakened, Shen Qinghe gradually realized that he was inextricably linked to a woman named Su Manqing a hundred years ago. The reverberation of time shuttles between the past and the present. She not only wants to unravel the secret past between her grandmother and Su Manqing, but also wants to find her own identity in the fragmented time review, and in the aftertaste of the reverberation, complete a gentle reconciliation that spans a hundred years.