Humming (2008)

Jun-Seo (Lee Chun-Hee) and Mi-Yeon (Han Ji-Hye) have been dating for a long time. Jun-Seo grows tired of his girlfriend's unfailing love, and volunteers to do research work in Antartica. One day, Mi-Yeon visits him, but he runs away only to find out that she had been injured in a car accident the day before. Did she really come to meet him after falling into a coma? Jun-Seo realizes her love and preciousness by retracing her steps.