Shen Ning, a highway toll booth operator for six years, relies on meticulous observation to sharply detect hidden major hazards in vehicles. Resisting multiple pressures, steadfastly upholding his job responsibilities, decisively reporting for lockdown screening, and coordinating forces from all sides, he successfully defuses a major perilous situation. He holds respect for rules and harbors responsibility, guarding traffic safety at an ordinary post, and uses carefulness and dedication to protect the safe journey home of thousands of travelers.