After experiencing a car crash, Jungkook loses his memories. Including the memories he had of his first love, Im Yoona....

Before the car crash, Yoona and Jungkook dating however Yoona broke up with him to pursue her dreams. As she began to miss him, she couldn't help but to want to be with him again. But as she finds out that Jungkook lost his memories, she finds out something shocking...

During the time period that Yoona was away, Ji Eun who likes Jungkook, confessed her feelings to Jungkook but sadly got rejected. But as Jungkook's memories are gone, she takes advantage of the situation to get with Jungkook.