jaejoong 023 dongbanger
1,500 Japanese fans will get to see Jaejoong on the set of his current drama Time Slip Dr Jin July 22 2012.

Time Slip Dr. Jin is a South Korean adaptation of a Japanese manga called "Jin" written by Motoka Murakami.  It also had a Japanese live action movie which aired in Japan back in 2009.

JYJ is super-popular in Japan despite being blackballed by Japanese entertainment company avex (which has direct ties with SM Entertainment).

This isn't anything new for JYJ.  They regularly attract thousands of non-Korean fans to South Korea with almost any public activity in which they're involved.