Song Hyung-joon was a member of X1 belonging to Starship Entertainment and is currently a member of CRAVITY.
Since May 2019, he has participated in the boy group Survival Audition Production X 101 organized by Mnet.
On July 19, 2019, he made his debut as a boy group X1 by finishing fourth at the final ranking announcement ceremony to determine the debut member.
The group name CRAVITY is a compound word of 'Creativity' and 'Gravity'. It contains the meaning of "I will attract you to our universe (parallel world) with my original charm."
It is also an abbreviation for Center of Gravity, and it also expressed its ambition to provide the best performance by achieving a perfect balance when different members come together.
On September 1, he won his first music show title with "Flame" on SBS MTV's "The Show" and impressed the public.