Xu Yang traveled through time and became the commander of the puppet army at Liuzhuang stronghold. He thought it was going to be a hell start, but instead activated the most powerful undercover system. Killing traitors, rescuing comrades, exchanging fertilizers for explosive formulas, and even taking photos to defraud Japanese pensioners. Li Yunlong was about to lead people to defend the stronghold, but he didn't know that this "captain of the puppet army" wanted to kill the Japanese more than he did.