Fu Haijun is a weapons science expert. He is very talented in research and development, but most of the results of his labor were stolen and patented by his boss Yu Yuanlong. This made him very annoyed. He wanted to find an opportunity to take revenge on his boss, but he couldn't. Cheng imagined that he and his boss traveled to the Tang Dynasty together in an unexpected scientific experiment, and then they battled wits and courage in the Tang Dynasty in a different parallel time and space. With modern knowledge, they started a different life in the Tang Dynasty and met the people they liked.
