After moving into his new home, 30 year old Kim Yun-woo often runs into his cheerful and eccentric eighteen-year-old neighbour and slowly finds himself strangely attracted to the teenaged girl. Meanwhile his new colleague, Kang Sook, who has just graduated from high school, falls head over heels for Kwon Ha-kyung, a melancholic woman who always smokes in the same spot near their office. Ha-kyung is still holding onto an old flame but Kang Sook continues to court her, regardless of her living in the past...and their age difference. Can their futures lead to a happy ending?