Based on the popular manga, Oh Ha Ni is a clumly student who falls for the perfectionist, Baek Seung Jo. However, Seung Jo is indifferent to wards her and rejects her love. When Ha Ni’s house collapses, she and her father moves into his long-time friend’s house. It turn sut that Seung Jo is the friend’s son and Ha Ni is given the oppotunity to be near the guy she loves. Ha Ni always making trouble for Seung Jo, but it is to attract the attention of Seung Jo. Until graduation party, Seung Jo embarrassing Oh Ha Ni by telling her friends about the book which contains about Ha Ni feelings. But Ha Ni reply Seung Jo with achildhood photo shows Seung Jo who wore women's clothes. Seung Jo was furious and take Ha Ni out of the party. Ha Nit old Seung Jo to let go of his hand and said that she would not bother him and like Seung Jo again. But apparently Seung Jo kissed Ha Ni.
Ha Ni and Seung Jo go to the same university, Ha Ni still loves Seung Jo and dont want to let go him.
However, many things that hinder their love. Among them is the presence of a third person into their relationship. There was abeautiful girl named Chae Rin which has similar characteristics with Seung Jo, and so is still being pursued Ha Ni chased by his high school friend named Bong Jun Go who likes Ha Ni since high scholl. Will she be able to get Seung Jo Heart?