Nichkhun Buck Horvejkul [better source needed] (Thai: นิชคุณ หรเวชกุล; RTGS: Nitchakhun Horawetchakun; born June 24, 1988), better known by his stage name Nichkhun (Korean: 닉쿤), is an American rapper, singer, songwriter, model and actor. He is currently based in South Korea as a member of the South Korean boy band 2PM.
Read about Nichkhun in Wikipedia