Because world stars need home fanbases too

First he had that (as predicted) rather forgettable turn in Speed Racer. Then there was that Kung Fu Panda theme song he recorded that was overshadowed by Cee-Lo’s better (and "official") version, after which he spent some time in Germany bulking up to shoot Ninja Assassin.
After such an extended stretch of time away from singerly (and actorly) activities at home — his last album, "Rain’s World," and last domestic acting project, I’m A Cyborg, But That’s OK, were both back in 2006 — "world star" Rain is coming back to Korea to resume activities there, beginning with a fanmeeting on the 27th.
Rain held a fanmeeting in Tokyo on June 30, while this event is expected to draw a capacity crowd (approx 3,000) at Seoul’s Olympic Hall, and attract his fans from all over Asia. Hopefully he still has some left after his less-than-stellar "world tour" last year ended in mass cancellations, slipshod planning, and tons of angry fans, many of whom weren’t able to recoup ticket prices or travel expenses after flying across the country (some across the world) to attend his U.S. (non-)appearances.
The fanmeeting will be emceed by Kim Jae-dong and is being called "Summer Vacation with Rain." According to his company, JTune Entertainment, Rain is currently busy at work on his next album, aiming for an October release.
I think Rain is at his best when he’s not overextending himself and trying to do a dozen different things simultaneously in his attempt to conquer the world; hopefully this marks a return to more successful endeavors.

Credit: dramabeans.com