Kepnes explained the darkness of You, which deconstructs the romantic-comedy tropes highlighted in many films and shows, by making the protagonist, a violent stalker and serial killer, saying it was written in a dark period of her life, the year her father died of cancer, and in which she experienced several other personal challenges. Later, Kepnes was initially hesitant on labeling Joe, as a few readers argued that his actions, classified him as a serial killer. The author then, clarified her position on the matter, citing that "I remember when I wrote You and someone first referred to Joe as a serial killer. I argued 'he’s not a serial killer, he meets these terrible people and has these awful thoughts, but he’s very sensitive'. It’s very strange to realise you have written a serial killer.