Do you remember how many pinky promise you have made? and how many did you keep your promise?

Maybe you would remember the one you have made last week or yester day. But how about the one you made when you were five?

"HeeYeon ar, when we grow up, I will definitely marry you!" He raised his pinky out and waited for the girl in front of him to hook it. She nodded and hooked his pinky with a huge smile. She actually didn't know what the boy was talking about. She was too small to understand the concept of marriage, or even the word 'marry'. The only thing she knew, that made the reason for her to hook, was this boy would never break the promises he made. He would do everything to strike for his promises. It was simply because he was Im HyunSik.

But reality never as perfect as we thought. They separated due to some issue. After so many years, they experienced different things and went through ups and downs by themselves, friends and family, but not with each other. But HyunSik never forgot his promise. 

Maybe God was moved by his persistence. He gave a chance for them to reunite. However, after over ten years, their innocent, immature minds were changed, more things had occupied in their mind and heart. Even worse, their memory faded. The journey for him to keep the promise also more difficult when someone was trying to add more obstacles between them...