After celebrating and drinking at their friends’ party, Jane (Natthaweeranuch Thongmee) and her photographer boyfriend Tun (Ananda Everingham) get into a car accident. Jane runs over a young woman that she didn’t see. With much fear, Tun prohibits her from getting out of the car: they drive away, leaving the girl lying on the road.
Tun begins to discover mysterious white shadows and what appear to be faces in his photographs. A suspicious Jane thinks these images may be the ghost of the girl they hit on the road. Tun, who has been experiencing severe neck pains since the accident, visits a specialist and is dismayed to find that his weight is double his regular weight. Unconvinced of the existence of the supernatural, Tun dismisses the idea of being haunted although his friends are also being disturbed by this mysterious girl.
Jane discovers that the girl was Natre (Achita Sikamana), a shy young woman who had attended the same college as Tun. After confronting Tun, Tun admits that he and Natre were in a relationship, which Tun had kept secret from his friends. Natre loved Tun dearly and threatened to commit suicide when Tun abruptly broke off the relationship. Tun witnesses his friend, Tonn, committing suicide, and discovers that his two other close friends from college have also committed suicide. Believing that they have been coerced into doing so by Natre’s ghost, Tun becomes convinced that he will be next.
The haunting of Tun by Natre’s ghost escalates, so he and Jane visit Natre’s mother. At her house, they discover the decaying body of Natre in her bedroom. They learn that Natre had committed suicide, but her mother could not bear to have her cremated. Natre’s funeral is held the following day, after which Jane hopes that everything will return to normal. Tun and Jane spend the night in a hotel, where Tun wakes up and is confronted by Natre’s ghost. Tun tries to escape but is pursued; ultimately, while trying to get away, he falls off a fire escape and is injured.
However, on returning to Bangkok, Jane collects some photographs. One of the films shows a series of images of Natre crawling towards the bookcase in Tun’s apartment. Jane finds a set of negatives hidden behind the bookcase. She develops the negatives to find photographs in which Tun’s friends—the ones who committed suicide—are sexually assaulting Natre. Utterly disgusted by her findings and now convinced that Natre tried to warn her, a teary Jane confronts Tun. Tun admits that he witnessed the rape but did nothing to stop his friends, and that he was the one who had taken those photos. He says he did it out of peer pressure and has never forgiven himself, but Jane leaves him.
Knowing that he is still haunted by Natre, Tun begins taking pictures of every room in his house, but does not see Natre in any of the photos. He throws the camera across the room in a rage, only for it to go off, taking a photograph of Tun, revealing Natre sitting on Tun’s shoulders. In the ensuing confrontation, Natre covers Tun’s eyes making him unable to see, making him lose balance and fall out of the window.
The final scene shows a badly bandaged Tun slumping over in a hospital bed while Jane visits him. As the door swings closed behind Jane, the glass reflection shows Natre still sitting on his shoulders.