Yang Gaeun, a sophomore in high school, was new to SHS. She's as innocent as they come. She's never had a boyfriend much less talked to a boy as anything more than a friend. She's beautiful but guys don't find it fun to go for the Mary especially when they're going to get nowhere. Nam Woohyun was the popular guy in SHS. He had everything, the looks, the money, the social status, and not to mention girls practically throwing themselves at him left and right. Name a pretty girl, he's had her. He's looking for a challenge, someone that'll be hard to get and when Gaeun walks his way, his target is set.