After death, people have to pass through the gate of hell and pass through the Underworld Road. The boundary between the Underworld Road and Hades is drawn by the Wangchuan River. The blood waves in the river are full of lonely ghosts who cannot be reincarnated. There is Naihe Bridge on the Wangchuan River. If you want to cross the Wangchuan River, you must cross the Naihe Bridge. If you want to cross the Naihe Bridge, you must drink Mengpo Soup. The story is written about some gossips and miscellaneous notes before crossing the River of Forgetfulness.