The small border country of Mobei was unable to resist the attack of the Central Plains dynasty of Great Qin, so it chose to cede territory to seek peace and even sent its crown prince Mo Changfeng to Great Qin as a hostage. Mo Changfeng, who endured the humiliation and lived in eternity, found temporary peace under the care of Qin Biyao, the princess of Qin Dynasty, and briefly had similar interests with Qin Jiangmo, the prince of Qin Dynasty, and Yu Wenjun, the son of the prime minister, drinking and hunting together.
In a royal autumn hunt, the appearance of Yu Wan'er, a folk girl, broke the pattern of the three princes and princes. At the same time, the king of Mobei attacked Daqin for revenge, but was brutally destroyed by Daqin. After the king was captured, he was beheaded in public. Mo Changfeng escaped death due to the interference of Princess Qin Biyao of the Qin Dynasty, but was placed under house arrest for three years. Three years later, with the help of Yu Wan'er, he managed to escape back to Mobei. From then on, Mo Changfeng was perverted by the desire for revenge. Later, he planned to kill Yu Wenjun, the commander-in-chief of Qin Dynasty. In order to save Yu Wenjun, Yu Waner chose to die together with Mo Changfeng
