Actually..does it really matter? To be fair, other than Winter Sonata which was her 1st drama in Japan. She has hardly done other promotions for the others. THe BD concert was by Yedang and not the TV station. Winter and BD were both by NHK. If you can remember clearly, NHK started to come out with a lot of events which they "EXPECTED" her to be there whenever they wanted her. Perhaps, learning from the experience of NHK, she has chosen to stay away from too much direct promotion. Also, STH was being widely promoted by the other star Gwon Sang Woo. So, was there really a need for her to do so ? Anyway, I don't see no loss whether she did or did not promote it.