To save his younger sister, who has fallen unconscious from poisoning, escort guard Lu Chen accepts an exorbitant payment to protect and escort the wealthy young lady Su Qingyi from Jiangnan across the vast desert of the Han Sea. Along the way, they face ambushes by horse bandits, poisonous creatures, assassins from the black market, and black sandstorms. Amid these life-threatening ordeals, the two gradually go from distrusting each other to becoming inseparable companions who depend on one another for survival. After arriving at Canglang Pass, Lu Chen unexpectedly discovers that the mastermind behind everything is none other than Su Qingyi's maternal uncle, Chen Yuan. He storms the military commander's residence alone, rescues Su Qingyi, and finds the antidote. In the end, their transaction is settled, and they each go their separate ways, yet an unfinished bond remains between them in the martial world.