Everyone has been asking who is the mystery girl?… She is the girl who bought Junsu’s soccer uniform at the auction for 2,230,000 KRW (approximately 2,000 USD) for the charity auction mentioned in the previous articles (Link). The charity auction provided that the winner of the uniform would get to actually meet Junsu too. She asked him whether JYJ’s A-nation Performance was all live, and Junsu said Yes. The girl said that people think that their A-nation performance is not all live, and Junsu said “That’s a compliment!” She writes that she is the same age as Junsu. She also says she does not regret spending the money ^^.
Source: DC TVXQ Gall; XiahSoul