Astronaut Xiang Shaolong encounters a black hole in the "Nebula" spacecraft accident and travels back to Handan, the State of Zhao, three years before the King of Qin was enthroned in the Warring States Period more than 2,000 years ago. In order to return to the future, Xiang Shaolong decides to find Ying Zheng at all costs and help him create a great achievement. From then on, he begins his search for Ying Zheng. On the way, he not only gets involved in the conspiracy of the power officials of various countries but also encounters the ancient girl Xing Yun, creating a legend in the Warring States Period.