In the summer of 1969, university student Yoon Suk Young (Lee Byung Hun) goes to the countryside through a volunteer program. Coming from a wealthy but strict family, the laid-back youth revels in the simplicity of rural life, especially when he meets local librarian Jung In (Soo Ae). Suk Young immediately falls in love with the charming Jung In, and in ten days of acquaintance, they form a lifetime of memories. Jung In's cheerful front, however, hides a bitter story; her parents defected to North Korea when she was younger, and she continues to live in the shadow of her parents' actions. When Jung In travels to Seoul with Suk Young, the couple get swept up and torn apart by the political tensions of the time.