(aka Sassy Girl Chun-hyang) Lee Mong-ryong, son of a decorated chief of police, is transferred from Seoul to a high school in Namwon, North Jeolla Province, due to his constant fighting. He accidentally bumps into Sung Chun-hyang, shoots embarrassing photos of her and ends up swapping her cell phone with his. As a result, they are constantly in touch with each other and find out they attend the same school.