LOONA Assemble, better known as Loossemble is a South-Korean girl group who debuted on September 15th, 2023. The group consists of five members, all from LOONA: HyunJin, ViVi, Go Won, YeoJin and HyeJu (Formerly known as Olivia Hye).

The concept behind Loossemble is that the five girls are preparing for an adventure to find their friends. Fans theorize that their “friends” are the other members of LOONA and that they’re trying to re-assemble all twelve members of the group. This concept was revealed on a 19-second trailer that was posted on the group’s YouTube channel.

The group made their debut under CTDENM with the mini-album, Loossemble and its lead single, “Sensitive.” During this time, the group also held their first ever tour, LOONA Assemble: the U.S. Debut Ceremony, which was held in eight different cities across the United States including New York, Los Angeles, Chicago and more.