Supernatural crime solving + time paradox. The background of the world is a period of high incidence of "crime behind the door". A supernatural being called "Keeper" can sneak into the body of ordinary people through the door of consciousness, and erase the memory of the host after completing the crime. The special department "Subliminal Investigation Section" established by the police is aimed at such cases. The protagonist Su Ming suffered a severe head injury during an arrest. When he woke up, he discovered that he could share the murderer's perception of the moment of the crime after contacting him - not only could he recreate the scene, but he could also "look back" and see the door behind the murderer. But the most fatal twist is: when Su Ming went back for the fifth time, he saw the person who opened the door had his own face. The other person handed out a note with the time and place written on it. The note said: "Stop me, or you will kill everyone in 2026."
