The series tells the story of how Qin Shihuang Ying Zheng, with the assistance of Lü Buwei, Li Si, Wang Jian and others, pacified the six kingdoms, unified the world, and established the first unified centralized state in Chinese history. In the late Warring States period, the Chinese land, which had been in chaos for more than 500 years, was still in constant war and suffered. At that time, the six kingdoms were weak, Qin was the only strong country, and the trend of world unification gradually emerged. The wealthy businessman Lü Buwei fled back to Qin with Ying Yiren, who was held hostage in Zhao at the time. The young Emperor Qin Shi Huang was abandoned in Handan and suffered repeated life and death disasters. He also witnessed the pain and despair that the war brought to the people, and the ambition of uniting the world was born. After that, Ying Zheng returned to Qin, experienced mental pain in the political whirlpool of Xianyang, and transformed into a true king. In order to seize the opportunity and power to unify the world and realize the ideal ambition of unifying the world, he carefully planned and acted in secret, and finally quelled the rebellion of Lao Ai, took power, dismissed the prime minister, and regained the royal power. After that, he eradicated the restoration forces of the royal family and cleared the obstacles for the eastward expedition to destroy the country. With the assistance of Li Si, Wang Jian, Meng Tian and other civil officials and generals, he wiped out the six countries and established the first unified centralized state in Chinese history.