Lee Seoyoon is not only Sungmin's younger sister, but also one of SM Entertainment's most talented dancers.  She is an exceptional choreographer, once a trainee with big dreams but ultimately deciding to go down a different path.  She is a loving friend who wants nothing more than to help those around her and make a difference in their lives. She is also a girl who has been so consumed by the negativity of her repeated failures throughout her years of working in the enter