It' usual that the idols are featured in magazines, newspapers, online reports and posters. However, it's peculiar to see them in an academic book.
One example is JYJ's Jaejoong. His picture is used in a computer textbook. The students who used and who are currently using that book, definitely encountered the page with Jaejoong's face on it.
Meanwhile, JYJ was chosen to be as honorary ambassadors for the ‘2014 Incheon Asian Games’. They made a teaser video of 'Only One' showing their preparation, recording and filming.
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Source : dkpopnews[dot]net