In 1127, on the anvil of history, a dynasty was forged in half. If Song Qinzong had not listened to the slander, and if Li Gang's "move south to avoid enemies" had been implemented, could the fate of the Northern Song Dynasty have been rewritten? This is not a passionate counterattack, but a serious deduction placed on the scales. After ten years of crossing south, the Yangtze River became the boundary. The emperor and his ministers weighed repeatedly between food and grass, people's hearts and swords. The bloody spirit of the war party and the ruthlessness of pragmatism, the emperor's two ends of the scale, the loess of the old capital on one side, and the rice of the south of the Yangtze River on the other. When the horn of the Northern Expedition sounded in 1141, what was captured in Bianjing was not a heroic epic, but a gamble calculated on fate. They won, but they also lost the last elite team. There is no golden finger, only a cruel game between time and trend.