High school students Jung Yujin and Sang-Hyuk have been close friends since childhood even though Sang-Hyuk wishes to become more than friends. In the midst of a winter season, Yujin meets the mysterious but talented Kang Joon Sang, a new student to her high school. Yujin suddenly finds herself fascinated and soon even in love with Joon Sang, very much to the jealousy Sang-Hyuk. But when a car accident abruptly kills Joon Sang, Yujin loses hope as well as her one love.

Ten years later, Yujin owns a successful architectual firm called "Polaris" and is engaged to Sang Hyuk. As the new bride heads to the engagement ceremony, she is stopped in her tracks by a man who looks exactly like Joon Sang. She pursues him and memories of ten years ago rush back into her mind.