It was revealed that Rain was cast in Brian A. Miller's new action thriller 'The Prince' as a character named Mark, who is friends with Bruce Willis's character, Omar.  

He left Korea on November 30 to start filming in America on December 1.  He let all of his fans know about this by changing his Twitter profile picture to the one below, which looks to be a sign on his trailer as it says 'The Prince' and 'Mark,' his character's name.

Rain also plans on returning to Korea to come back as a singer on January 6 so expect a lot of Rain from hereon.