It's about a girl named Seo Joo Hyun and a boy named Cho Kyu Hyun. Joo Hyun is a girl with glee, having no home to be a shelter for her, no family, everyday walking along the sidewalk offering the pedestrians around for some fresh food and drinks to buy. Then she will smile to anyone who passes by even though if their eyes are not on her. Sometimes she has some things that insist her to burst her tears out but she always try to hold them. Kyu Hyun Kyuhyun is a 18-year ager who's studying in the best university in Seoul which is only giving lessons for top students which is given a scholarship to be able to study there. He got the look, he can buy anything he wants to and he has lots of fangirls which he really doesn't care about but he will still be nice to them and has some boy friends to hang out with. He's living in his not-really-big house with her little sister, Sooyoung who's a year younger than him. What he loves the most are playing music especially piano and violin, solving puzzles especially those which are related to Mathematics, and playing computer games.