A group of brilliant scientists achieved a remarkable bioengineering breakthrough in 2017, but unfortunately, all new technologies were employed for military purposes, leading to a new arms race. Among the most advanced weapons available in this race were vanguards, the most significant achievement in modern bioengineering. Despite their exceptional combat effectiveness, vanguards' life expectancy was curtailed by the nanomachines they employed. As a result, most vanguards left the army after several years of service. After executing missions for an extended period, Liuli, the protagonist, had also used up too extensive a portion of her lifespan. She was left with a mere 380 days when assigned to rescue a hostage in a civilian facility. It was a very challenging task for a vanguard who knew nothing but fighting and killing. However, she obediently accepted it. During the mission, Liuli surprisingly discovered that the hostage-taker was a former vanguard named Zhongrong Zhou. Zhou pleaded with the government to hand over the son of Eden, which triggered a deep disdain within Liuli as a vanguard. The battle between the two vanguards erupted to rid the vanguard scum.