"Math tells us three of the saddest love stories. Parrallel Lines; which were never meant to meet, asymptotes; which can get closer and closer, but will never be together and tangent lines; which had one chance to meet, and then parted forever." ~via Zenithzinc on tumblr~   Despite being brothers, Jongup and Daehyun are worlds apart. Jongup is quiet, reserved, shy and cute. Daehyun is outgoing, wild, fun, popular. Dspite this, they both find interest in the same girl. 

Soyi and Jongup. Teenage sweethearts, first love. But everything changed when Jongup was accepted as a trainee at TS Entertainment. It meant leaving Soyi, moving away from their rural town, and starting over. And for some reason, he unnecessarily breaks up with Soyi after accepting her most prized posession, a golden locket. So why is he back, determined to win her over, when ten years have past? Why is he announcing on live television that Soyi is his, after not contacting her for ten yera

He had the chance to go to prom with her, he really did.  But it never worked out, and things were too complicated despite his best friend Junnah yelling at him that it was simple, obvious and he should take advantage of single status of the girl he'd been in love with for three years.  But now he's graduated college and she's still on his mind.  Which is stupid, because she's in America, and he hasn't seen her for five years,