In the 23rd year of the Republic of China, Jiang Haoran, who traveled through time and space, took root in Nanjing. Facing the Japanese army's relentless reconnaissance and infiltration, he used modern military wisdom to weave a city defense network in troubled times. He used material procurement to evade the Japanese army, relied on military exercises to conceal his reserves, and created simulated streets to practice offensive and defensive street battles. He also teamed up with businessman Xu Shiming, student Li Enyu and others to build business intelligence channels, set up a password system, and hid food and medicine in cave warehouses. From resolving the spy crisis of internal factions to leading the military and civilians to work together to defend against the enemy, Jiang Haoran, as a "think tank", twisted ordinary people and passionate soldiers into a rope. On the land of Jianghuai, he wrote an anti-Japanese legend in which the weak resisted the strong and protected the country.
