Zhao Wujiu, a doctor in military industry, traveled through time and became a prisoner on death row in the Qin Dynasty. He offered a black powder formula to survive, but was suspected by Qin Shihuang Yingzheng of being a monster because he could not explain the source. Between the Shadow Guard's blade and Li Si's conspiracy, he relied on his knowledge of chemistry to save the day, but he also unintentionally undermined the foundation of the Qin Dynasty. Ying Zheng wanted to use him, but also guarded against him. The two were dealing with temptation and trust. However, Xu Fu's covetousness and Fu Su's prejudice made Zhao Wujiu's every step like walking on thin ice. When the black fire blasted open the Lishan tomb passage, he heard his future self's voice coming from the recording pen, and realized that this time travel was no accident.
