Dark version:
If you love too deeply and for too long, this love will become my obsession with you.
I can't let go or forget.
I can only pull you to sink into that world with me...
Monologue version:
I'm dead, I'm really dead.
I thought that after I died, I could forget him and no longer suffer this unrequited pain.
But even if I become a ghost, I can't forget him.
King Yama said, my obsession is too deep and needs to be resolved before I can be reincarnated as a human being.
So I came back to him, and I had special powers.