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On the first day of class a young teacher enters an unruly room and begins his first lecture. To gain the students' attention he relates the story of what probably led him into a life of mathematics. Told via flashbacks, the young teacher goes back to a time, probably 20 years earlier, when his mother was hired to look after a professor who suffered brain damage in an auto accident. The brain damage didn't harm the personality of the man but limited his short- term memory to 80 minutes. The accident occurred 10 years earlier, in about 1975, up to that point the professor has a clear memory of events.

Jeerawat ,or Jee, is an actress and model. She had a bad childhood, her mother left her with her grandmother and marries someone else. Her stepfather wants Jee to be his mistress, so one day he drugs her so that he can rape her, but she manages to escape and drives off hitting and killing Tiw, Satit's fiancee. Satit is a lawyer with a bright future. He is friends with Chaiyan, a director, who happens to be very close friends with Jee. When Satit meets Jee, he lashes out at her, in anger, at every opportunity. Then, he notices the closeness between Chaiyan and Jee, and believes they must be having an affair. Although Chaiyan has feelings towards Jee, they are only good friends. Piak, Chaiyan's wife, is jealous of their closeness and also believes her husband is having an affair with Jee. So Satit and Piak conspire to ruin Jee's reputation, defame her and destroy her career. But as Satit goes on with his revenge he realizes the good in Jee, while Jee also falls for him along the way.