Customs officer Shen Qitong is reborn and returns to her duty scene. Facing students carrying unknown powder for a live-streamed provocation, she decisively presses the alarm to seal off the passageway. With the assistance of colleagues and the support of superiors, Shen Qitong withstands public opinion pressure, ferrets out smuggling suspects mixed in the crowd through rigorous inspection, and summarizes standardized operating procedures, ultimately defending national border security and professional dignity.