During the founding of the Khitan Kingdom, they fought against the ancient Bohai Kingdom. Yelu Abaoji commanded an army of 400,000 to press the border. The Bohai monarch was incompetent and had long been dismissed. General Gao Li led the army and the people to resist tenaciously. Just as the troops were approaching the city, the Khitan prince Yelu Bei disappeared mysteriously. Yelu Abao ordered General Xiao Agu to search secretly, and he wanted to see people living or dead or corpses. Xiao Aguzhi ordered his confidant Xiao Yuncuo to look for the prince. Xiao Yuncuo made inquiries and learned that the prince was imprisoned on the Dry Soul Island in Qingni Pucheng, so he made a plan to rescue the prince.
Purpose: To end the sorrow of war