Guimoon: The Lightless Door (2021)

Plot

In a quiet community center in 1990, a custodian brutally slays the guests before ending his own life. Since that tragic night, the site has been haunted by eerie occurrences every Old Year's Night. After years of abandonment, a famous paranormal investigator, still grappling with the loss of his mother during an exorcism, teams up with three curious college students intrigued by local legends. Together, they venture into the decaying building, determined to reveal the dark secrets hidden within its walls and confront the malevolent forces at play.