Lin Rui, a seasoned veteran, finds himself burdened with significant debts and is struggling to support himself, unable to secure employment. Following yet another unsuccessful job interview, he encounters a mysterious middle-aged man who presents him with a contract for a military security company. This contract transforms his life, as he becomes a contract employee engaged on battlefields around the globe. He travels to various regions to undertake extremely perilous missions in conflict zones, evolving from an unnoticed battlefield pawn to a renowned mercenary king.