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The story revolves around the relationship that develops between two college students, So-Eun (Kim Ha-Neul) and In (Yoo Ji-Tae), who connect via a radio one night. However, when they decide to meet on campus and miss each other, it is revealed that they are separated by 21 years, with So-Eun in 1979 and In living in the present day, 2000. Eventually, they become comfortable with the supernatural phenomenon that has brought them together, as well as their correspondence. She relates her camaraderie with her best friend Seon-Mi (Kim Min-Ju) and her pining for fellow student Dong-Heui (Park Yong-Wu), while he talks about the unwanted attention he receives from fellow co-ed (Ha Ji-Won). However, as the on-air relationship deepens, it is revealed that their ties go far deeper than ever imagined.