To repay a debt, Chen Xun goes ginseng-digging, mistakenly enters a cave, and travels back to the Tang Dynasty during the An Lushan Rebellion. Using modern knowledge and a system space, he gathers refugees, forms a guard unit, and leads refugees to struggle for survival in chaotic times. Relying on modern equipment, he leads the team to defeat the rebel army. He meets fleeing Princess Ayao, Uyghur female general Yaoluoge Yue, and others, facing court suspicion and rebel threats, but always insists on keeping everyone alive and trying to carve out a way to live for all.