After Zhao Kuangyin established the Song Dynasty, he wiped out several separatist forces. The power of the Song Dynasty continued to grow. Zhao Kuangyin's younger brother Zhao Guangyi saw it and was happy in his heart. Unfortunately, it was not in his brother's hands that he could make the decision, so he began to be jealous of his brother's achievements, and he was swayed by his personal advocacy. At this time, the Southern Tang Dynasty still did not surrender, so Zhao Guangyi began to plot a conspiracy to seize Zhao Kuangyin's power. Zhao Kuangyin volunteered to take command and personally conquer the Southern Tang Dynasty. Zhao Kuangyin agreed without even thinking about it. As a result, after the Southern Tang Dynasty was annihilated, none of his close associates returned to the court. Zhao Guangyi was only part of the plan on the way to annihilate the Southern Tang Dynasty, and the code name of the plan was Longqi.