At first, Choshinsung was a five-member boy band but it was turned to a six-member through many times of changing their members. For this reason, they had to put their debut on after 1 year and recorded their album again. Before the debut all of members participated in commercial movies and other singer’s music videos. Then, they debuted through M.net M! PICK which is a TV program of picking up new faces for making Korean entertainers in August 2nd, 2007.