One summer day, Sandeul returns to Garam's small high school. Garam doesn't really remember him, although they used to be friends when they were little. Sandeul is outgoing, handsome, and popular whereas Garam is a shy social outcast, ignored by all her classmates. However, that mundane summer changes when Garam finds out about Sandeul's secret. And Garam will not be able to forget it, because Sandeul will keep floating in her mind...