Seungyeon(You) is not exactly a common girl. She is the happy virus of her group, no matter how hard a situation is she will always smile brightly and get over it. What happens when despite all her effort and passion, she can't get Sehun's heart?

I don’t really remember the first time I saw him, though I think it was some time around freshman year, perhaps in the hallway. Truthfully I don’t know if it was love-at-first-sight, but he surely left a deep impression. Up until then I had always thought things such as love-at-first-sight were for easy girls, but I was real wrong, too bad I didn’t realize it before I experienced it myself.

Seungyeon is in Senior year, and despite the time passed, she still has a crush on Sehun. She doesn't know much about him, but that doesn't stop her heart from beating everytime he's near her, now what will she do?

Will she let her crush go?

or

Will she keep trying?