Playful Kiss (YouTube version)

He is tall, athletic, good-looking, and the smartest boy in school. She is not so smart, a little clumsy and on the average side in the looks department. Against all odds, Oh Ha Ni falls head-over-heels in love with Baek Seung Jo, the most popular boy at her high school. Ha Ni musters up the courage to confess her affections in a love letter but is shot down by the indifferent Seung Jo. Could a boy like Seung Jo ever return her pestering admiration?