Documentaries record real social life, objectively reproduce real people, true feelings and true scenes, and exclude fiction and acting. However, "reality" is relative. Documentaries record all the real stories -- past events -- by means of images. In other words, artists can neither make up a certain event nor rearrange the shooting of what has already happened. [2] therefore, the "truth" created by this medical documentary is also relative. The "truth" of "the world" lies in the fact that the camera records the realistic dilemma faced by doctors, patients and their families when facing the life and death problem. "doctors and patients are supposed to be Allies", which is enough to arouse people's thinking on how to understand medicine and how to face death and other major issues.