Lin Yue was selected to join the "Retrograde Project" - a secret organization that can travel back in time and modify history. He returns to key moments in history time and time again to prevent wars and save lives. But he gradually discovered that every time history was revised, the real world would become better, but his memory was disappearing little by little. He forgot his name, the faces of his family, and only remembered that he had to keep going retrograde. In his last mission, he traveled back in time to prevent the death of the organization's founder. He succeeded and returned to reality - the organization no longer existed, and he was the only person in the world who still remembered the "Retrograde Plan".
