Wooyoung and IU don't know each other. They only know each other through notes from the same book for math class. At first their friends but they start liking each other through the notes. What happens after that... Wooyoung http://www.askactor.com/images/casts/Korea/25974/Wooyoung_12.jpg IU http://userserve-ak.last.fm/serve/_/59377371/IU.png