The "gathering up" of a second-hand bookstore on the verge of closure has become the starting point for uncovering centuries-old family secrets.
When Li Wan, the third-generation shop owner, discovers the incomplete diary of her grandmother Lin Yuehua from 1947, the dusty time suddenly opens up: the underground intelligence of turbulent Shanghai, the truth about the mysterious disappearance of her mother Li Jing's husband in 1992, and the mysterious "gear" symbol in series, which is actually closely connected with the emotional bond between her and the architect Cheng Chen in the modern city.
The strange color vision disorder inherited by Li Wan is actually the key to opening the folds of time and space, allowing her to glimpse the past that was covered up by the bloody conspiracy. Faced with the "Silver Bird" organization that manipulates the undercurrent of history and the annihilation plan called "Lighthouse", Li Wan must piece together the truth in the broken time, using his blood as a guide, and strive to travel between the war of 1947, the fog of 1992 and the current crisis, to protect his loved ones and prevent the overthrow of time and space. A journey of redemption spanning three generations of women begins quietly in the deep folds of time.
