Return of the Great Song Dynasty

After the Jingkang Incident, the Central Plains fell and the new emperor fled south. For more than thirty years, the Han people in the northern land changed their clothes and performed nonsense. Shi Hao, the prime minister of the Song Dynasty, proposed to the emperor that those who entered from the north and the south were righteous people! The Han people are one family, how can we distinguish between northerners and southerners...