Field nurse Shen Zhao was taken into the interrogation room by commando captain Huo Lin as an enemy spy. He didn't know that she was the "Snow Owl", the commander-in-chief of the war zone who controlled the overall situation. When she rescued his seriously injured comrade with the code written in blood, when the undercurrent of betrayal by Deputy Director Zhou Yan surged, and when her old enemy Ke Zheng locked her traces, she must use a medical record, a string of passwords, and the courage of an orphan to reverse the course of the entire war in the storm of her identity being revealed. And Huo Lin will eventually discover that the spy he hates the most is the commander he should protect the most.