Loona is a South Korean girl group formerly under Blockberry Creative. The group was composed of eleven members: Heejin, Hyunjin, Haseul, Vivi, Yeojin, Kim Lip, Jinsoul, Choerry, Yves, Go Won, and HyeJu. Originally a twelve-member group, Chuu was removed from the line-up on November 25, 2022, due to a contract dispute. Starting in October 2016 and lasting for 18 months, each member was introduced to the public through a solo promotional single as part of a pre-debut project. The group debuted as a full ensemble on August 19, 2018, with the extended play (EP) [+ +], supported by the lead single "Favorite" and the title track "Hi High".

Kim Ji-woo, known professionally by the mononym Chuu (츄), is a South Korean singer and television personality. She is a former member of the girl group Loona and its sub-unit, yyxy.