In 1997, architect Sung-Hyun moves into the home 'Il Mare' that his estranged father built. One day, he pulls out a letter from his mailbox. The letter is from a young woman who addresses the new occupant of the 'Il Mare' house. Sung-Hyun is surprised because he is the only person to have moved into the home. More letters arrive and in those letters her predictions are accurate. She warns about a flurry of snow on a certain day in January of 1998 and an ensuing flu virus. Eun-Joo is convinced that her letter has traveled back in time to December of 1997 and starts writing regularly to Sung-Hyun. Eun-Joo decides to ask Sung-Hyun to find her cassette recorder, which she lost at a train station. Sung-Hyun goes to the train station and gets a glimpse of Eun-Joo ...