I know it's not Korean, its Chinese, but I don't know what it means. There is a part of Korean that uses Chinese Characters called Hanja, but neither me nor my sis can understand it.
Translates from Chinese(Simplified) as: [rquoter] Ha Ha-ha. . . . . . Not tell you! [/rquoter] courtesy of: http://www.google.com/language_tools?hl=en
To be more phonetically precise, it's actually: Hehehe.. not gonna tell ya! I'm sure you'll find that alters the entire meaning of the phrase