Kep1er is a South Korean girl group formed through the reality survival show Girls Planet 999. The group debuted on January 3, 2022, under Wake One Entertainment and Swing Entertainment. It consists of nine members, who were selected based on their popularity and talent during the show. The name Kep1er is derived from the name of the astronomer Johannes Kepler, symbolizing the group's goal to reach new heights in the music industry. They are known for their energetic performances and catchy songs, quickly gaining a dedicated fanbase both in South Korea and internationally.