Prelude's Robin

A middle-aged widower lives with his 19-year-old daughter. One day she died on the railroad tracks, She died wearing her beloved red dress, It looks like a red Mansha pearl. Everyone said she committed suicide. Until someone told my father, His daughter often communicates secretly with a man named Utopia, She often talks to herself in front of the empty grass, Does utopia really exist? What is the truth? Purpose: looking for the truth