In 1990, at a secluded community center, the custodian murders all the guest lodgers and kills himself. Ever since, on every Old Year's Night, paranormal events begin to take place within the building. Eventually, the center is shut down and left abandoned for years. A renowned paranormal investigator who had lost his mother during an exorcism and three college students who heard about the rumor of the unexplained phenomena heads over to the building, resolved to uncover the buried secret.

Guimoon: The Lightless Door

Dan-bi dreams of becoming a children's book author but finds herself starting her career as a rookie member of a Youth Protection Team that blocks illegal pornography. By a twist of fate, she ends up signing an unfair contract with CEO Hwang, a dominant figure in the web erotica industry, and is forced to moonlight writing erotica for him. Struggling with the unfamiliar genre, Dan-bi faces many challenges. However, with encouragement from her colleague Jung-seok, who is experiencing a mid-career slump, and inspiration drawn from her friends' past sexual escapades, she unexpectedly discovers a hidden and divine talent within herself...