I'm looking for a mystery novel, but I forgot the title. It involves parallel spaces and an "I'll kill me" plot.

He had read a novel seven or eight years ago.
The opening scene seemed to be about the male protagonist dreaming that he was being hunted. When he woke up, he realized that the words "I killed me" were probably carved on the wall.
The main plot was that when the male protagonist was young, he went to an abandoned factory with some friends. Just as the male protagonist wanted to enter the factory, an image of the factory on fire and himself being burned appeared in his mind. Therefore, the male protagonist stopped his friends from entering, but they did not listen. In the end, the factory really caught fire.
Later, when the male protagonist was in university (or possibly middle school), there was a murder in the school. The face and fingerprints of the corpse were destroyed, and there were a few footprints left at the scene. There was a cross between the big toe and the toe. As the male protagonist's foot was slightly deformed, the footprints of the male protagonist matched the footprints left at the scene.
In fact, the murderer was the male protagonist from another parallel space, and the one who died was also the male protagonist from another space. It was the male protagonist of another dimension who was disfigured by fire when he was young. He was jealous of the male protagonists of other parallel dimensions, so he killed them.

Answer 1

The book I recommend to you is Help Me Find My Dead Body. It's a suspense-mystery-mystery novel. The protagonist of the story, Lin Yun, entered a scripted game and constantly performed various strange missions, and his goal was to find his own corpse. In the game, he was constantly exposed to the concept of parallel worlds and parallel spaces. The story also involved some mysterious plots about " I killed me." I hope you will like this novel.