Du Xiaonan, an ordinary college student, accidentally became a bridge between the yin and yang worlds - a "Spirit City Courier" who specializes in delivering express delivery to the supernatural world, and suddenly became the "sweet potato" in the hearts of ghosts. While punching in and picking up items, Xiao Nan solved puzzles and removed curses. With the help of clerk Meng Xiang, Yang Jianfa Xiao Zhou Miaomiao, and naughty ghost Cha Xiaoyu, Xiao Nan wandered through the ancient alleys of Lingshi, the underworld of Styx, and the shadows of the city. Behind the endless spate of ghost stories are fateful reincarnations, entanglements of grudges, and a conspiracy sweeping across the Yin and Yang worlds. In a relaxed, humorous and thrilling atmosphere, Du Xiaonan gradually reveals his own life experience, and finally participates in the decisive battle in the spiritual world - completely reversing the fate of yin and yang imbalance.
