Walking Backwards in Darkness

Is it impossible for a person to step into the same river a second time? The river is no longer the same river, and the people are no longer the same people. If people can become ghosts after death, what will ghosts become after death? Isn't this world so perfect? ​​Isn't there a perfect world? Is the world changing with people's ideas, or are people changing with the great changes in the world? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.