When unemployed young man Chen Fei is on the brink of desperation, he is forcibly bound to the Spirit Realm Courier System and becomes a courier traveling between the worlds of the living and the dead. He delivers packages containing the lingering wishes of the deceased, paying with his own remaining lifespan to stay alive. Along the way, he meets Bai Ling, a customer service representative from the spirit realm, and Shen Ye Han, a forensic pathologist. As he completes multiple missions involving unresolved obsessions, he uncovers a sinister dark-domain logistics conspiracy orchestrated by the villain Meng Wuchang. Chen Fei unites forces from both sides of the living and dead, stages an extraordinary comeback, and destroys the evil forces, ultimately becoming a guardian of the order between the two worlds.