Song Han Gyeom, formerly known as A-Day, is a member of Spire Entertainment's boy group Omega X debuted on June 30, 2021 and a former member of the boy group Seven O'Clock. He participated in JTBC’s survival show "Mixnine". Song was announced ranked 6 for the Male Team and was later announced the winner and part of the debut group. In October 2022, a video of the CEO of OMEGA X's label