Cheng Shunli, a graduate student majoring in mechanical manufacturing in the 21st century, was in a traffic accident and time-traveled back to the Jiajing period of the Ming Dynasty. When he found that his family was impoverished and destitute, he was not discouraged. Instead, he used the knowledge and skills he learned in his previous life to build a metal detector. He obtained hundreds of kilograms of gold, opened a shop, sold tea and silk, became a wealthy businessman, and achieved financial freedom. During the Jiajing period, because the emperor was obsessed with Taoism and did not care about government affairs, and treacherous ministers were in power, there were many factions. Along the southeastern coast, Japanese crowns were raging, burning, killing, looting, and committing all kinds of evil. The government was incompetent, the army was ineffective, and the people were in dire straits. Cheng Shunli resolutely gave up business and joined the army, dissipated his family wealth, recruited local brave men, raised the banner of anti-Japanese war, and used the knowledge he learned to develop advanced weapons such as the Crouching Tiger Cannon and the Three-Eyed Gun, which dealt a heavy blow to the arrogance of the Japanese pirates and became a famous anti-Japanese general.
