Urban white-collar worker Su Xiaowan stayed up late working overtime preparing to go home, and was wrongly soul-hooked by the soul-hooking messenger Hei Wuchang, accidentally falling into the underworld. She whose remaining Yang lifespan is not exhausted cannot directly return to the Yang world, and can only join the underworld to be a netherworld customer service, receiving departed souls, resolving obsessions, and handling netherworld chores to earn merit points. Only by accumulating enough points can she return to her physical body and return to the Yang world.