It tells the story of Guang Haijun Ranchen Japanese Rebellion at that time, after Xuanzu fled, Guang Haijun was canonized as the son of the world and fought alone to protect the country. The film unfolds the story from the point of view of the samurai guarding Guang Haijun. "acting army" refers to the story of people who had no money and power to join the army instead of rich and powerful aristocrats in the Korean era.