Su Wan carries a cryptographic chip and travels through No Man's Land to defect to her uncle, while her father hires veteran Gu Ye for 400,000 to escort her. Along the way, they encounter human trafficking, snake venom, and bandit pursuits, shifting from mutual disdain to entrusting each other with their lives. Upon reaching the border, Su Wan hands the chip over to her uncle Su Ningzhong, but Gu Ye notices a spider web tattoo on her arm—the exact mark of the Zhuluo Gang that attacked his father years ago. Gu Ye encounters an ambush on his return trip, learns the truth, and turns back to rescue her. Su Wan is already imprisoned by her uncle at this point, and Gu Ye comes against the wind.