Lee Wee-jin typically spends his high school days serving his flawless sister, Lee Wi-na. Yet he harbors a secret he cannot reveal to anyone: he can materialize his delusions at will. Whenever he needs to vent the stress his sister causes, he manifests a version of her to punish. One day, however, a black-haired transfer student points a knife at Wee-jin and declares: "You damn delusioner that materializes delusions, we wakers will get rid of all of you!"