Songhu fell, and the Japanese troops marched towards Nanjing, putting the ancient city in danger. Shen Qinglang, a modern college student, accidentally fell into troubled times and was trapped in a desperate and isolated city. Put down the books, pick up the guns, and resolutely join in the battle to defend the city. Clean up broken troops, strengthen defense lines, and protect thousands of displaced people. He faced the wolves with his mortal body and protected the mountains and rivers of Jinling with his flesh and blood. Not an inch of mountains and rivers could be lost, and his family and country could not retreat even a step. In the war-torn times, he vowed to defend Nanjing to the end and reverse his tragic fate.