Getting out of the math class was better than anything for Jung Daehyun. Daehyun hated math so so much, especially Mr.Lee, the math teacher. Mr.Lee is the most strictest and meanest teacher Daehyun has ever known. But then..Daehyun found out that Mr.Lee has a daughter named Lee Haeri... Haeri was going to transferred to their school and most importantly of all...she's going to be in the same class as him. And that's when Daehyun thought of revenging on Mr.Lee...and his revenge is to make Haeri fall for him and then break her heart. What's going to happen? Will Haeri fall for him? Happily ever after? Will he sucess on making her fall for him?