Exist Within (2022) (korean) -

: As her obsession grows, Ho-kyung notices her presence. What starts as a hunt for a story descends into a tense game of cat-and-mouse that uncovers a dark reality about her neighbor. Key Cast & Production

The story follows , an aspiring but struggling writer living in unit #401. Desperate for a winning idea for a screenplay competition to help her family's finances, she becomes obsessed with a persistent "thudding" noise coming from the apartment above her, unit #501. Exist Within (2022) (Korean)

Amazon Prime Video (purchase/rent or free with ads in some regions). Plex and Hoopla (free options). Exist Within (2022) - IMDb : As her obsession grows, Ho-kyung notices her presence

The film is available on several streaming platforms, including: Rakuten Viki (with subtitles). : As her obsession grows