Li Xiang, a dawdling courier boy, accidentally gained the ability to see ghosts due to a bizarre car accident, and was recruited by the "High-Tech Profession" in the underworld as a yin-yang courier. He carefully delivers packages between ghosts and humans, but is accidentally involved in the underworld's conspiracy: the underworld system is paralyzed, part-time ghost workers are on strike, evil spirits are rampaging, mysterious evil things are awakening... And mysterious organizations are eyeing the spiritual power of the human world. He stumbles along the way, teaming up with the errant girl customer service Su Tao, the magic stick A Fu, and the never-reliable underworld boss to experience hilarious life and death moments while dismantling the clues of the mission. In one supernatural adventure after another, Li Xiang gradually grows into a brave and responsible new generation of yin and yang envoys. In the end, Li Xiang led the team to expose the mastermind behind the scenes, save the world of humans and ghosts, and complete his own road to redemption with humor and tears.
