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Boy group DBSK U-Know Yunho, Choikang Changmin and SS501 Kim Hyun Joong and Heo Young Saeng appeared in SNSD concert and created lots of attention.
4 of them attended the SNSD concert at 4pm, 20 December in Seoul Songpu-gu, Seoul Olympic Park Fencing Stadium.
It was commonly known in the entertainment circle that U-Know Yunho, Choikang Changmin and SS501 Kim Hyun Joong, Heo Young Saeng are best friends even though they are from different groups. Their attendance despite the cold weather had attracted the attention of a lot of fans.