Su Xiao, who runs a photo studio in an old alley of "Yuncheng" that is about to get cold, has a secret that she has hidden for many years - the photos she takes always contain pictures that are not of the present for some reason: sometimes they are 28 bicycles from the 1980s, sometimes they are oil-paper umbrellas from the Republic of China. Until one day, a man named Shen Xinghe came to develop a yellowed old photo. The scene in the photo was exactly the same as the old building that Su Xiao had repeatedly dreamed about. What's even more bizarre is that the old pocket watch Shen Xinghe carries with him emits a faint light every time it comes close to Su Xiao's camera, and those "abnormal pictures" will become clear. As the contact deepens, Su Xiao discovers that her photo studio is the entrance to the "time gap", and Shen Xinghe is the guardian who searches for "time fragments" across time and space, and these fragments are her lost past life memories. While collecting fragments to repair time loopholes, the two of them fought against the "Dark Time Organization" who wanted to use the fragments to tamper with history. In the process of traveling between the past and the present, they gradually recovered their deep love that spanned a century.
