In the autumn of 1934, a young girl, Li Tingting, carried a medicine box and embarked on the Long March, from Ruijin to northern Shaanxi, surviving bullets and bullets, and walking through snow-capped mountains and grasslands. She protected her comrades as a health worker, and also met and got to know the Red Army company commander Chen Jianfeng during the war. Twenty-five thousand miles of blood and fire, they depend on each other for life and death, interpreting the weight of faith and love with their youthful passion.