In a certain corner of the city, there is a seemingly ordinary little shop — Shiguang Photo Studio. The shop's proprietors Cheng Xiaoshi and Lu Guang can enter a photograph and explore its original time and space. One day, Lin Kai, a rising star in the traditional opera scene, came to the studio and asked Cheng Xiaoshi and Lu Guang to find a person in a picture from 10 years ago. There is only one photograph, and there will be only one chance… (Source: Bilibili, translated)