Huang Shijie, the girl that Zheng Zeyuan loved, died suddenly in a car accident. In order to save Huang Shijie, Zeyuan used the camera she left behind to travel through time and space and returned to the day of the high school performance when he was 18 years old... He kept traveling through time and space to change the past, but he couldn't save Huang Shijie after all. It wasn't until the end that Zeyuan realized that he was not the only one who had traveled through the gaps of time thousands of times...