Modern surgical master Zheng Chenyuan's soul traveled through the years of the Anti-Japanese War and fell into the smoke battlefield of "Bright Sword". Faced with the desperate situation of lack of medical treatment and medicine, he used the "Hippocratic Secret Code" as an edge to refine penicillin with local methods, which shocked the base area and increased the survival rate of the wounded in the independent regiment. Li Yunlong filed the case for help, Zhao Gang gave his full support, and even Chu Yunfei asked for help from afar. On that day, the invaders launched germ warfare and poison gas warfare. Zheng Chenyuan, holding a lancet, built a mobile operating room amidst artillery fire to solve the medical dilemma. On the battlefield where life and death intertwined, he and the pretty nurse Lin Wanxing went from fighting side by side to becoming deeply in love, and together they wrote a battlefield legend that coexisted with passion and tenderness.