The protagonist, Xu Bo, is a male. His parents died when he was young, and he and his sister Xu Yan depend on each other. He enters the military camp by chance and grows into a generation of heroes. During an operation in Afghanistan, he accidentally kills his teammates and his good brother Yuan Qin. Before the good brother died, His sister Yuan Xin and brother Yuan Le, who were entrusted to him to take good care of him, were forced to retire after returning to the army. He returned to his hometown to take care of his sister and his brother's family. But everything was not so beautiful. He could only join the mercenary and became a frightening black blade mercenary boss.
