If you have the video file, open it in VLC, go to View > VLsub , and it will automatically search for matching subtitles for you.
Trapped in a bizarre domestic triangle, Hlynur is forced to confront the adulthood he has spent a decade avoiding. He oscillates between manic jealousy and crushing nihilism. He tries to sabotage the relationship between the two women, but his efforts only highlight his own irrelevance. As winter deepens and the Icelandic nights grow longer, the apartment becomes a pressure cooker of unspoken tension and strange family dynamics. 101 Reykjavik subtitles English
Check if your streaming service (like MUBI or Kanopy) has the "CC" (Closed Captions) or English toggle enabled. If you have the video file, open it