This movie had a god plot line. It was not the usual shoot em up or spy that normally goes along with a character that defects from the north. The dancing was decent, but you could tell they used a stunt double (I used to dance ballet so I can tell that they have a stunt double whenever you don't see their heads). Lee Yong Woo's dancing seemed to be pretty good (or they edited so it wasn't obviously a stunt double). Choi Tae Hwan dancing was so so, his movements were stiff and he needs to work on rounding his arms. But his good acting made up for it.
Overall I would recommend watching this is you are a fan of dance/ballet or if you want a touching story of how you can achieve your dreams through hard work.