In 1990, a janitor working in the training center in Guisari, committed a mass murder before killing himself. Since then, a suicide or a fatal accident has occurred every year, and the center has had no choice but to close its doors. Paranormal rumors began to spread, calling the entrance a “guimoon” (door used only by ghosts). Three students decide to go there to confirm the rumors. At the same time, Do Jin, the director of a psychic research institute, visits the abandoned training center to try to understand the death of his mother.