The Grotesque Mansion (movie, 2021)

Horror webtoon writer Ji-woo arrives at a shabby apartment called Gwanglim Mansion in search of ideas. The middle-aged caretaker with an expressionless facial expression unravels a bundle of strange events that happened in the apartment, and rooms 504, 708... The more Ji-woo hears the story, the more he becomes obsessed with the Ghost Mansion.