The photo studio is run by them and their names are Toki (Cheng Xiaoshi) and Hikaru (Lu Guang). Toki has the ability to enter the world of a photograph and link his subconsciousness with the photographer’s. His business partner, Hikaru, has the ability to perceive what happened up to 12 hours after a photo was taken. Through Rin, Toki’s childhood friend, they receive requests from clients who are still hung up on the past, and use their powers to solve whatever secrets may be hidden in the photos.

They carry out their clients’ requests while sticking to their guiding principle of “never altering anything in the past.” However, when Toki's strong sense of justice causes him to slip up, his actions have a ripple effect which slowly starts changing the future.