In her past life, emergency physician Shen Nanyi gave in to temporary softness and let go of four college students returning from overseas who lied about their condition, causing severe public health hazards and leaving a massive regret. Returning once again to the day of the initial diagnosis, facing these four college students who deliberately concealed the situation and sought attention, Shen Nanyi decisively activated an emergency early warning and isolated the area for treatment. Facing pressure and criticism from multiple sides, she dealt with it calmly, guarded the safety baseline, prevented the crisis from spreading, and safeguarded the health and safety of the local masses.