The growth process of ordinary young people from surviving in a foreign battlefield to becoming a top mercenary explores the boundaries between survival and humanity, loyalty and betrayal. Lin Feng, 22 years old, comes from a lower-class family. He was desperate due to family debt/accidents (such as a serious illness of a relative). He accidentally learned about the "overseas security" recruitment information through underground channels. He mistakenly thought it was a regular job, but in fact it was a front for a mercenary company.
