The OST is a good mix of pop songs and ballads so far. U.S. The songs can only be found on iTunes in the U.S. by searching in English under the artists name in English. A search under Junsu and Kim Junsu does not yield his track though it may not be out yet. I prefer to support the artist by a proper purchase and download. K- pop is now an official genre on iTunes but the search engine could be improved. When you find a title and you click on related to find the other titles, you don't get the other titles from the drama. Setting aside the shortcomings of iTunes, the music is fun and a good listen in between episodes. The OSTs are a big part of why I am hooked on k-drama.
