His real name is Daniel Dae Kim and Justin reports that he chatted with him at the Nelly show last night. No word yet if he spilled the beans on his character's fate on LOST (they showed his grave last season!).
Since I'm a LOST junkie, I find it funny to imagine Justin and DDK communicating across a language barrier like his (Korean) character often does on the show. (skip forward to 1:17 to see what I mean)