After three years of silence following a messy breakup, Fred Weasley believes he has finally mastered the "science" of living without you. He has poured his life into the chaos of the shop, convinced that the distance was the only way to survive. But when he catches a glimpse of a restricted Instagram story on Ron’s phone, his world is dismantled by a single image: you, radiant and tired, celebrating the first birthday of a daughter with unmistakable Weasley hair. As the "numbers and figures" of their final night together begin to add up with devastating precision, Fred is forced to confront the haunting reality that while he was busy trying to move on, a part of him was starting a life he was never invited to join. It is a story of the quiet tragedy of missed time, the cruelty of a perfect mathematical truth, and a desperate plea to go back to the start.