Based on a series of true stories posted by Ho-sik Kim on the Internet describing his relationship with his girlfriend. These were later transformed into a best-selling book and the movie follows the book closely. It describes the meeting of Kyun-woo (Cha) and an unnamed girl. Kyun-woo is shamed into assisting the girl because the other passengers mistakenly think she is his girlfriend. Once he helps her, Kyun-woo develops a deep sense of responsibility for her which enables him to tolerate (somehow) the girl's abuses. Written by Thomas Giammarco giammarcoken@hanmail.net

In 1983, high school teacher Ji-hwan is attacked by a pickpocket. In 2015, homicide detective Gun-woo is shot during a chase and loses consciousness. Both men are taken to the same hospital in different time periods, and both their hearts stop and miraculously start again at the same time. A mysterious force binds them together, allowing them to see through each other's lives in their dreams. Soon realizing that the woman they love strikingly resemble each other and that they are in fatal danger, the two men must team up to trace the past and change her destiny. Written by CJ Entertainment

A lonesome college student, Jiro, is spending his 20th birthday alone, when suddenly, a beautiful girl turns up. The few hours that he spends with her are the most incredible moments of his life and Jiro is overwhelmed by his good-fortune in meeting her. But his happiness does not last long as she disappears as suddenly as she appeared. A year later, on his 21st birthday, Jiro runs into her again at the same restaurant, where she saves him and countless others from a crazy assassin. She looks the same, but this time she is somehow different. It is the beginning of a relationship that would change his life forever. Written by Anonymous

Shy Ji-hae's friend is having problems expressing her feelings to the boy she loves, so she asks Ji-hae to write e-mails to him in her name. As the boy falls in love with her letters, Ji-hae discovers the story of her mother's romance which is remarkably similar to her own circumstances.