Oh young-Shim, first grader of high school, is proposed by popular singer Jeon Young-Tae but he becomes her brother-in-law 3 months later. Young-Shim goes to a blind date with her friend Wal-Suk and meets Mun-Hwan. But she is annoyed by Kyeong-Tae who always follows her like a shadow. She feels sore about her academic results which are always average 75 in spite of hard working. And she loves the principal but physical education teacher who is like an old fox never forgets to disturb her. The principal, who fixes his gaze on Young-Shim, is known to have astigmia. When Kyeong-Tae and Young-Shim meet bad guys on the street, Kyeong-Tae desperately defeats them at the risk of his life. As Kyeong-Tae is hospitalized because of injury, Young-Shim is awakened to his friendship and love.