Professor Lin, a scientist who lost his family in an accident, was afraid of dust. For decades, he has studied various methods to try to go back to the scene where his wife and children died to save them, but each time it has been a failure. Professor LinAn organization called the Space Time Restoration Bureau has emerged to ensure the irreversibility of time and space. So a bolder idea formed in Professor Lin's mind - since humans cannot change history in reality, then virtual characters areIs it possible? At the age of Professor Lin, her adopted daughter An An witnessed her father's longing for his wife and children and became ill. She was determined to personally embark on the journey and put his idea into practice.