DetailsDo-hyun (David LEE), is a dedicated English major who enjoys his college life. One day, Professor YEO (SEO Yi-sook) asks Do-hyun to help a newly transferred student who is undergoing psychological treatment. Through this, Do-hyun meets Professor CHOI (SON Byung-ho) and undergoes hypnosis. When he wakes up from being hypnotized, Do-hyun begins to have visions of unknown memories. Meanwhile, his friends also face mysterious incidents and suffer from strange hallucinations. With repeated mysterious events and strange afterimages from nightmares, Do-hyun and his friends wonder why Professor CHOI started hypnotizing them. What is the horrifying reality that is happening to Do-hyun and his friends?