Just take Tohoshinki (TVXQ/Dong Bang Shin Ki) for example; they got big enough to sing the remix of One Piece's first opening song for its 10th anniversary, not mentioning that they also sang the new opening song that came after that. Another one would be 2PM who sang the first ending theme of Blue Exorcist.
Other pretty popular ones are Kara, Girls' Generation (SNSD/Shoujo Jidai), EXO, The Boss (Dae Guk Nam Ah/Daikoku Danji), JYJ, Super Junior, and SHINee.
I'm pretty sure if you bring these people, a hoard of fangirls will raid the registration booth haha.
This post has been edited by lawlchan: 01 February 2013 - 02:21 PM