A clumsy high school girl named Oh Ha Ni (Jung So Min) who was in the bottom of her class has had a crush on a popular and genius male student, Baek Seung Jo (Kim Hyun-joong) ever since she laid eyes on him on the first day of high school. Ha Ni decided to confess through a letter, but is rejected rudely by Seung Jo, who tells her that he hates stupid girls and returns the letter having corrected all of her mistakes.
Fate intervenes when an earthquake ruins Ha Ni's family's newly built home. While the house got rebuilt, Ha Ni and her father stayed at the home of her dad's childhood friend, who happens to be Seung Jo's father. Ha Ni's feelings for Seung Jo rekindled, and she was more than determined to impress him. Seung Jo was ignorant to her feelings and found her an absolute nuisance. However, having a matchmaker mom, Hwang Geum Hee (Jung Hye Young) helps Ha Ni a lot.
The drama continues with portraying Seung Jo and Ha Ni moving into university. There, Seung Jo meets Yoon Hae Ra (Lee Si Young), the female Baek Seung Jo. While, Bong Joon Gu (Lee Tae Sung), Ha Ni's classmate from her school, still has, despite many incidents that have continuously broke his heart, feelings for Ha Ni. However, Ha Ni still liked Seung Jo, despite the fact that he was always with Yoon He Ra and that he said that he lives for teasing her.
Oh Ha Ni's feelings continued to grow just as the friendship between Baek Seung Jo and Yoon Hae Ra did too. Baek Seung Jo's father soon being hospitalized, he took over his father's gaming company temporarily. He was soon introduced to the investor's grand-daughter who is none other than Yoon Ha Ra, at a marriage meeting between Hae Ra and Seung Jo. With everything going on, it seemed impossible for Seung Jo to like Ha Ni. Bong Joon Gu also doesn't give up on trying to win Ha Ni's heart and one day, he took his crush one step further by proposing to Oh Ha Ni. After this, Ha Ni walks back to her fathers, Oh Ki Dong's (Kang Nam Gil), Noodle shop in the rain to find Baek Seung Jo standing with an umbrella, waiting for her. As the night continued, Seung Jo claimed to be curious about her answer for Joon Gu, knowing that he had proposed, but Ha Ni refused to tell him. This leads to an argument between the two, causing Oh Ha Ni to have an outburst which is interrupted by a kiss from no other than her love, Baek Seung Jo.
The drama concludes with the new couple walking back home and announcing that a marriage be formed. During their honeymoon, they encounter another couple who the female of the couple is flirting with Seung Jo in front of Ha Ni. She then fakes an internal injury since Seung Jo told her that he is majoring in Medical area, then when her husband tries to inspect her, Ha Ni gets jealous and Seung Jo and Ha Ni have an argument which leaves Ha Ni to leave. Then when Ha Ni leaves the room, the female then tries to get in bed with Seung Jo but the male comes back and tells them that Ha Ni left the hotel. Then Seung Jo realizes that the female was faking and goes to find Ha Ni.
Soon everybody meets a foreigner named Chris. Apparently she is British and Korean. So she is able to speak Korean very well, and people are amazed.She has a crush on Boon Gu who says he only has room for Ha Ni in his heart and again confesses in front of everyone. Ha Ni tries to switch her major to nursing, which she cannot get into. On her date with Seung Jo on Christmas Eve, she witnessed an accident involving CPR which she learned. She must reach a decision to risk her being arrested because of CPR not being done correctly or at least trying. She tries and then the person begins to move. She then accompanies her to the hospital which made her late for her date with Seung Jo. However, Seung Jo had waited for her. Meanwhile, Min Ah becomes a famous cartoon artist and Joo Ri is friends with a person back from the military who came everyday for a trim. The finale ends with Ha Ni and Seung Jo making out in the company car.
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