Left to the naive but good-hearted high school girl Cha Young-mi's own devices after the tragic loss of her parents, Young-mi is determined to overcome whatever hardships the future may bring in order to complete her education. Through the help of an invisible benefactor who pays for her tuition fees and other necessary expenses, Young-mi is able to finish her studies and is offered her dream job as program writer for a radio station. It is there that she meets and falls in love with her colleague Kim Joon-hoo. After Young-mi discovers a desperate message left behind by the former owner of her computer she decides to do something to help this heartbroken person …