Young-Soo (Shin Ha-Kyun) and Min-Yun (Kim Hye-Na) are teachers at the same school and also lovers. Young-Soo has now lost interest in Min-Yun. While travelling, Young-Soo meets a student's mother named Mi-Yun (Moon Jung-Hee). Young-Soo has an affair with Mi-Yun and falls in love with her, but is eventually dumped by Mi-Yun. After the break-up Young-Soo feels desperate. By chance, Young-Soo sees Sun-Hwa (Jung Yu-Mi) on the street and feels something for her. While following her, Young-Soo saves Sun-Hwa from a man chasing her. Sun-Hwa then tells her love story to Young-Soo. They promise to meet the next day, but Sun-Hwa asks Young-Soo to not love her. Since than, in order to gain her love, Young-Soo delivers her letter to a man. Young-Soo feels loneliness ...