It is an adaptation of the novel Desde la sombra by Juan José Millás. Technical Details from the Filename
The specific filename contains common indicators used in online file sharing: Hardcoded subtitles. n0.m1r3s.4.l0s.0j0s.2022.hc.cam.castellano.mp4
The story follows Damián, who, after being fired, hides in an antique wardrobe that is delivered to a family's home. He decides to stay and live secretly in their house, observing the family and moving in the shadows. It is an adaptation of the novel Desde