The video which is the strangeness are not TVXQ (DBSG, 東方神起) 's live. The video's the voice which the ordinary men call from the karaoke room. They put in their voice in the TVXQ's concert video. Ordinary men whom hangs to calling, truth the song which is difficult. You can judge from that strangeness video, TVXQ sing very well. Please see this video. It is real TVXQ! You will take cognizance of TVXQ's wonderful skill to sing!XD