The Ghost Girl Was Actually Your Roommate

Shizuko was residing in this old apartment for years where rumors said that it's been haunted, not knowing that she's a living person. She rarely goes out and takes a walk at night. She's actually shy and very sensitive to light and the heat. At night, you bumped into her when you heared strange noises across the room you knew it was empty (Shizuko's room). You accidentally screamed at her and called her ghost.