Since "bitter moon" is clear, and "fylm" is "film", "danlwd" likely = "bitter", "zyrnwys" = perhaps "polanski"? Let's check: p→z? No. Could be "director" or "roman".
But your phrase includes "bitter moon" — likely a known film: Bitter Moon (1992 Roman Polanski). "fylm" = film (shift: f→f? y→i? l→l? m→m? No, maybe "fylm" is "film" with cipher: f=f, y=i (+? y=25, i=9: difference -16 or +10? messy). danlwd fylm bitter moon zyrnwys farsy bdwn sanswr
Try "bitter" = "danlwd" — maybe each letter is reversed alphabet position? No. Since "bitter moon" is clear, and "fylm" is
