In the modern city where materialism abounds, ordinary courier Lin Yuan accidentally bound to the "Life Exchange System" and started a counterattack. But this is not only a competition of strength, but also a trial of protection. He will use this power to travel between different lives to protect his loved ones and break injustice. Through repeated choices and sacrifices, he will complete the sublimation of his soul from a low-level person to the guardian of destiny, explaining that true strength comes from fighting for the one he loves.
