Lost in Love (2006)

Song Yoon Ah portrays Yeon Ju, a timid young girl who maintains a secret crush on her platonic male friend, Woo Jae. Her shyness frequently gets the better of her, and she can only stand idly by and watch as Woo Jae suffers a broken heart at the hands of his ex-girlfriend and, consequently, get kicked off the school's crew team due to his resulting attitude problem. Later, while Woo Jae is in the army, Yeon Ju visits him, hoping to spend the night with him. Unfortunately, just as in their school days, Woo Jae is totally oblivious to her intentions, and a disappointed Yeon Ju goes home. Years later, we catch up with Yeon Ju to find that's she's now a divorced veterinarian in a local clinic, while Woo Jae is, ironically enough, a high school crew coach. The two meet once more, and the certainty of a romance between them seems inevitable, as the once clueless Woo Jae warms to the idea of being with Yeon Ju. But after he finally makes his move, Woo Jae bumbles himself right out of a relationship, and the visibly frustrated Yeon Ju decides it's finally time to move on. When Woo Jae eventually realizes both the enormity of his mistake and his love for Yeon Ju, he goes after her. But with a potential new beau in her life, is it too late?