“It Follows” is about a curse that is travelled through sexual relations instead of by seeing a bloody suicide. As in “Smile,” the curse manifests itself in individuals who appear regular initially. They can appear out of nowhere and from any place, in some cases strolling at a slow pace. If they reach you, they will eliminate you and pursue the last person with menstruation. Maika Monroe’s performance as Jay anchors the movie, making her sense of continuously surviving on the edge feel palpable.
Jay likewise faces an ethical dilemma. The only method for her to endure is to continue to outrun the mysterious specters or pass menstruation on by making love with somebody else. As in “Smile,” these weird figures shapeshift and might be anybody Jay sees: an older female, a naked guy on a rooftop, a high male that emerges from the shadows. They wear blank, menacing expressions rather of smiles. It is frightening to think that a beast might be hidden inside anybody you experience.
Writer and director David Robert Mitchell frames these individuals from a range, much like the scene in “Smile” where Rose opens her blinds and sees somebody staring at her from the medical facility grounds listed below. The concept of being closely viewed by someone up until now away without even understanding it is very unsettling. “It Follows” is more open-ended, however it is just as elegant and shares the same paranoid apprehension as “Smile.”
Source: https://www.slashfilm.com/1037024/the-two-horror-movies-you-need-to-watch-after-smile/