The timid Lin Fan encounters Xiao Yun, a cute and goofy amnesiac female ghost, while working late one night. By chance, he becomes bound to the sharp-tongued "Yin-Yang Comedy System." The System never stops making snide remarks, but its missions always revolve around "resolving supernatural threats and maintaining the balance between yin and yang." There is not a hint of parody; it is Lin Fan's timid, endearingly awkward nature and his frantic fumbling that give these serious missions their hilarious contrast.
To complete the System's missions, such as containing spirits, comforting lingering ghosts, and guiding underworld messengers as they escort souls, Lin Fan is forced to set out on a path of "supernatural incident management" with Xiao Yun. He uses braised pork to lure away a starving ghost who steals food deliveries, calms a depressed shut-in ghost with a game console, and exposes a misunderstanding in the company's women's restroom, where the supposed "red-dressed female ghost" turns out to be a trapped intern. Along the way, his friend Wang Pangzi goes from skeptic to "useful tool," the con artist Zhang Banxian is accidentally exposed by Xiao Yun, and Leng Yunyin, a member of the official "Abnormal Phenomena Control Bureau," takes an interest in Lin Fan after learning of his supernatural encounters.
As the missions progress, Lin Fan unlocks practical skills such as [Spirit-Binding Talisman] and [Spiritual Power Detection]. His embarrassing mishaps while dealing with the supernatural also unexpectedly draw attention online. Meanwhile, as Xiao Yun spends time with Lin Fan, she gradually reveals a talent for "empathizing with spirits." The fragments of memory that occasionally surface, such as a "red box," hint that there is more to her background and cause of death than meets the eye.
With its blend of "urban comedy and serious supernatural mysteries," the novel follows Lin Fan as he overcomes his fear and grows from someone "forced to take on missions" into someone who actively protects Xiao Yun and those around him. Along the way, it features fascinating interactions between the worlds of yin and yang, and the warmth of all kinds of ghosts
