Kahi and Jungah were best friends when they were kids, but when Kahi had to go to Europe, they lost contact. The two little girls made a promise to meet again and be together forever, sure that they would recognize each other. But when they meet again, they don't recognize each other and begin a friendship by which begin to develop in deeper feelings.But the shadow of the memory of that little girl from their past who promised to wait is lurking in the depths of their hearts, not knowing that this little girl is the woman they are facing and loving today.