Julian (Julia Roberts) and Michael (Dermot Mulroney) were college lovers. Like most lovers, their passion slowly cooled down until they became good friends. So before graduation, they made a promise: if they were still single before the age of 28, it would prove that they were a perfect match, and they would get married. After graduation, the two kept in touch, and Julian thought it was just friendship. However, Michael's marriage news made her wake up from her dream - she still loved Michael, and the strong jealousy and sadness made her unable to sleep and eat. Julian decided to change all this. She designed a series of ridiculous "plots" to make Michael's fiancee embarrassed in public and alienate their relationship. When she found that Michael's love for his fiancee actually prevailed, Julian made a crazy move at the wedding, which really angered the bride. However, things changed again.