A-Jax (Korean: 에이젝스, stylized as A-JAX) was a South Korean boy band formed by DSP Media in 2012. Early in their career, the group was known as DSP Boyz but then was changed to A-Jax. The group's final lineup was composed of five members: Hyeongkon, Yunyoung, Seungjin, Seungyeop, and Junghee. They made the first appearance on TV as a group on MBC Music's Making the Star – DSP Boyz on April 24, 2012. The group made its official debut with the single "One 4 U" in South Korea on June 1 and in Japan on August 8, 2012 with the same song.