It was recently revealed that the anonymous person who donated 50 million Won ($46,144 USD) to the Korean National Red Cross is in fact SS501's Kim Hyun Joong.
One insider stated on December 6th, "I heard that Kim Hyun Joong recently anonymously donated 50 million Won to the Korean National Red Cross to help out those in need." The Red Cross commented, "It's true that a famous celebrity donated 50 million Won on December 3rd. The donator insisted that he be kept anonymous, so we cannot reveal his identity."
Kim Hyun Joong also seems to have kept it from his own agency, Key East, as they reported they knew nothing of the donation.