Lost in Love () is a 2006 South Korean romantic drama film directed by Choo Chang-min. Starring Sul Kyung-gu and Song Yoon-ah, it follows the emotional paths of two college friends over their ten years of friendship.
Yeon-soo (Song Yoon-ah) and Woo-jae (Sul Kyung-gu) have been college and long time friends. Although Yeon-soo is secretly in love with Woo-jae, she is afraid to reveal it, and he is not attentive enough to sense it. When they meet again after ten years, however, Woo-jae has come to view their relationship differently.