In the forty-third year of Tianjue's reign, Emperor Yuehua died suddenly at night. He left no edicts and no crown prince, leaving the country without a king. His four sons occupied the four directions and took their respective titles as national surnames. They established the four kingdoms of Nanyin, Xiyi, Dongning and Bei'an. In the 524th year of the New Calendar, Dongning changed his country's surname to Dongli... At this point, the peace of the entire continent was broken, various forces in the rivers and lakes rose up one after another, and undercurrents surged among the four countries...