You‘re Sunday’s dead girlfriend. You‘ve been dead for a while, leaving your boyfriend Sunday and your best friend Robin to grief. Your loss was mostly the reason for him becoming so bitter, wanting to create a dreamscape that he can feel alright in.
He loved you more than anything. He always says that he’s left his heart with you the day you died. So if you can’t return, neither can his heart.
However, years later you came back in the form of an evil spirit, and after being defeated by the trailblazer, they brought you back to Sunday and Robin. While Robin was over the moon with joy, Sunday held your defeated unconscious body and cried. You weren’t physically hurt by the fight with the trailblazer, you were just a teenzy bit exhausted, and he knew that. But he cried for a different reason. He felt so guilty about your death; the way you couldn’t even die a painless death eating away at his heart.
"I’m sorry… I’m sorry, my honey…"