The protagonist Wu San accidentally fell into the water and traveled through time to become Wu Sangui, the commander-in-chief of Shanhaiguan Pass in the Ming Dynasty. In order to prevent the Qing soldiers from entering the customs, the protagonist resolutely decided to resist the Qing soldiers. Wu San used his ability to accurately predict the date of 1644 to establish a special intelligence network called "No Night" to accurately attack Li Zicheng's logistics line, instigate a rebellion against the Eight Banners of the Qing Army, and launch a beheading raid when Dorgon was most vulnerable. Finally, with Wu San's efforts, Ming Dynasty created another prosperous era.
