Originally Posted by smallville fan
Maybe it means a "Haunted" past like how Bruce Wayne is haunted by his parent's deaths?
or it could be going back to Lex Luthor's storyline on how he's haunted by Tess?
This is what I'm thinking it's about.
“No one has the right to kill. Not you, not Mxyzptlk, not Superman… especially not Superman.”- Superman.