Xu Liunian, a toll collector at a highway toll station, has developed keen powers of observation and a strong sense of responsibility for road safety through the daily routine of handing out cards, collecting them, and raising the barrier. During an apparently ordinary vehicle passage, his professional instincts alert him to something unusual. Despite doubts and mounting pressure, he stands by his principles and pursues the matter to the end. His attention to every last detail helps safeguard the lives of countless people. Even after enduring this test, Xu Liunian chooses to remain at the toll station, carrying out his duty of protection with every card handed out, every card collected, every barrier raised, and every watchful glance. His story conveys the positive values of dedication, courage, responsibility, and protecting others.