It's been seven years since she moved away. The two thousand miles of land tore apart a friendship, but they kept a promise. They wouldn't forget each other. She remembered the boy with black hair and green eyes, who gave her a flower to mend a fight. He remembers to think of her every time he sees a buttercup. Her family is moving again, back to the state where she made the promise. Back to the state of the green-eyed boy. Back to the state of her first best friend. Back to the state, where on a driveway, they said they wouldn't forget each other. He changed. Gone is the boy who picked flowers in kindergarten, who stood holding a buttercup bouquet to see her off. The boy who was best friends with the curly-haired, hazel-eyed, lonesome girl vanished. He matured into a heart-breaker. Yet the girl that moved away still held on to his own, unyielding in its grip to give up. They made a promise not to forget each other. But drastic changes in personality and appearance can make promises break. Unknowingly, they bump into each other. Not recognizing who the other truly is, they part ways. Cole is immediately drawn to the new girl, and he can't find out why. Rena finds familiarity in the person, not able to pinpoint where it's from. Cole takes the challenge upon himself to make them remember, realize they kept their promise. Tell each other, "I didn't forget."