In Shanghai in 1921, the situation was changing. Dai Li and Du Yuesheng became friends during gang fights and became brothers. Later, Lin Yue joined and the three of them broke into Shanghai together. In 1937, the July 7th Incident and the Anti-Japanese War broke out. Lin Yue proposed to Dai Li the establishment of a department for planting spies within the Japanese army, and the prototype of military unification was born. Since then, a thrilling spy war has begun. They battled wits and courage with the Japanese army in a crisis-ridden situation, fighting for the fate of the country. In this era full of uncertainties, their story is a legend of courage and wisdom, and a magnificent chapter of feelings for family and country, which contributed to the victory of the Anti-Japanese War.
