Love at first sight? Is it really exist in the real world? For a casanova Taecyeon, it is just a tale. However, after meet with Yoona his impression change. Everytime he look into her doe eyes, his heart beating so fast just like he had just run in a relay race. Meanwhile, Yoona doesn't want to involve herself to a playboy like Taecyeon. The truth is, will Yoona be able to avoid Taecyeon??   Why must him?? Why do i have to fall in love with him?? ~ Yoona