One day, while Yoon Se-ri (Son Ye-jin) is paragliding in Seoul, a sudden tornado blows her off course and knocks her out. She awakens to find her paraglide hanging in a tree in a forest in the North Korean portion of the DMZ. There she meets Ri Jeong-hyeok (Hyun Bin), who eventually gives her shelter and develops plans to help her return to South Korea secretly. Over time, they fall in love, despite the divide between their respective countries.
