During a summer vacation trip, college student Xing Tian was unexpectedly kidnapped. Relying on his innate combat abilities and extensive military knowledge, he narrowly escaped being hunted down. This incident brought him to the attention of "Wolf Pack," an internationally renowned mercenary organization, thus commencing his career as a mercenary. War is merciless, but brotherhood prevails. Surrounded by bloodshed, death, and the loneliness of being far from family, the profound camaraderie among brothers became his greatest solace. However, when his next mission required him to assassinate a former comrade-in-arms who had once fought alongside him in the trenches, Xing Tian was plunged into overwhelming spiritual terror for the first time. Having learned to face death with composure, how would he confront the torment of his conscience?