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.

An aspiring children's book writer agrees to write erotic web novels to pay her car repair debt – with unintended consequences for her coworker.

Seung Min wants to write an honest scenario. To get some inspiration, Seung Min decides not to get out of his room, only watching movies and writing. His friend and would-be actor, Jung Soo hears the news and worries him. One day, a man with a mask comes to Seung Min to invite to a masquerade.

Ja-yoon is a high school student who struggles with memory loss after she endured some unknown trauma during her childhood. While trying to uncover the truth, she is unwittingly dragged into a world of crime and finds herself on a journey that will awaken many secrets hidden deep within.