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Fantasy + suspense + system flow + mental hospital + twin redemption + obsession to become a demon + self-game + laboratory conspiracy + Cthulhu style + reality distortion + memory replacement + anti-routine system Also known as: "Delusion Clinic: System Modifier" "Will Killing Monsters in a Mental Hospital Will Level Up?" But the system countdown points to me." "The nurse was torn to pieces by a monster in front of my eyes, but the medical record says that I am the madman." "The patients always hum my nursery rhymes to coax my sister, but the medical records say that I am an only child." "The surveillance in the dean's office showed that my father was dragged into the bell tower, but he died in a car accident three years ago." When human beings' extreme negative emotions manifest into "delusions" that devour reason, a seemingly normal mental hospital is actually a container that seals abnormalities. The "Delusion Purification System" carried by the protagonist seems to be a weapon to kill monsters, but it is also the key to unlocking the seal of his own memory. The reality of the entire world is gradually collapsing with the upgrade of the system...