During the Republic of China, the border situation in northern Xinjiang was undercurrent. Guard Wei Zhao was stationed at the border checkpoint and encountered bizarre incidents such as the disappearance of sentry posts and the theft of defense plans. Using meticulous reasoning accumulated over many years of leading troops, he uncovered the hidden enemy agents lurking in the border defense team and smashed the conspiracy of foreign enemies to penetrate into the hinterland through the border. There was no female protagonist throughout the whole process, and the whole process focused on the hard-core competition between espionage reasoning and border guards.
