Im Yoona met this boy whose playing piano named Leeteuk.

A week after, she met Kim Yesung on the bookstore who was Leeteuk's cousin.

They were always together until an accident happened that separated Leeteuk from Yoona. :(

Years past, she was Yesung's fiancee until destiny brought her back to Leeteuk.

He found her as a stranger chasing him. He had an amnesia after the accident.

But then recognizes her by the locket and the letter she has. ♥♥♥