Perhaps there was an ancient ritual item hidden in the wall long ago. The ghost is somehow tied to this item, and it was meant to be kept a secret. The item might have been used for dark magic or something similar, and now the ghost is trying to either protect or expose it.
It could be the remains of a murder victim hidden in the wall. In many ghost stories, the presence of a wronged spirit is associated with the place where their body is hidden. So, the secret might be this gruesome discovery waiting to be found.
Maybe there's a hidden diary of someone who died tragically. It could hold their darkest secrets and unfulfilled wishes, which is why the ghost is still lingering.
It could be a diary or some letters that reveal a past event full of mystery and horror. For example, the diary might contain the story of a murder that took place long ago and the ghost is somehow related to the victim or the perpetrator. It's a common trope in ghost stories to have some hidden written records that hold the key to the mystery.
The secret might be the cause of the ghost's death. For example, if the ghost was betrayed and killed, and the evidence of that betrayal was hidden in the wall, the ghost would be tied to that location because of the unresolved issue.
It's hard to say. It could be neither. Maybe the ghost is just a manifestation of the secret in the wall. For instance, if the secret is a great sadness or a wrong that was done in the past, the ghost is just a symbol of that and doesn't really have a 'friendly' or'malicious' nature in the traditional sense.
In a haunted castle, there was a chamber that was pitch - black, except for a wall that glowed brightly. A knight entered the room, his sword at the ready. As he neared the bright wall, he noticed a strange symbol engraved on it. Suddenly, the room grew colder. A ghostly form emerged from the wall. It was the spirit of a long - dead sorcerer. The sorcerer's ghost told the knight a tale of a curse that was placed on the castle. The knight listened intently, and when the ghost finished its story, it vanished back into the bright wall, leaving the knight in the dark room to ponder the mystery.
Well, a dark wall at home in a ghost story might be a portal to another dimension. Ghosts could be using it to cross over into our world. It could also be that a tragic event happened near the wall long ago, and the energy of that event is trapped there, manifesting as a ghostly presence.
In a small house, there was a bedroom with a dark wall. A couple moved in and soon started experiencing strange things. They would often see a shadow moving along the dark wall at night. One day, they decided to repaint the wall. But as they started, they found old scratches on the wall that seemed to form words. The words were a warning from a ghost who used to live in the house, saying that the dark wall was its resting place and should not be disturbed.
I'm not sure specifically as it could be a very unique or self - created concept. It might be a love story that somehow involves a ghost and the idea of being 'atop the fourth wall', perhaps a story where the ghost is in a unique position related to a fictional boundary like the fourth wall.
" Fallen Flower: Ghost Hitting the Wall " was a novel about a young man named Yang Yun who encountered many dangers and challenges after crossing into a different world. He needed to use his wisdom and skills to protect himself and others, and gradually discover the secrets and truth of this different world. In the process, he met some like-minded people and experienced some touching stories.
One possible theme could be isolation. If a boy is in the wall, he is likely cut off from the outside world, which can symbolize feelings of loneliness and separation.
One possible theme could be mystery. If there is a woman in the wall, it's very mysterious how she got there and what her story is. Another theme could be survival if she was trapped in the wall for some time.