LOONA, stylized as LOOΠΔ (Hangul: 이달의 소녀; lit. Girl of the Month) is a 12-member South Korean girl group under BlockBerryCreative, a subsidiary of Polaris Entertainment. The group has been garnering attention since September 2016 and is considered one of the most ambitious and large-scale projects in the history of K-Pop.

Each individual member released a single album up until the group's official debut. A new member was introduced each month. Prior to debuting, the members also promoted in sub-units, each with their own defined concept.

The links below display an overview of the sub-units and their respective members.

  • OVERVIEW
  • LOONA 1/3
  • ODD EYE CIRCLE
  • LOONA yyxy

yyxy: OVERVIEW

yyxy (Hangul: 이달의 소녀 yyxy), stylized as LOOΠΔ/yyxy, is the third and final pre-debut sub-unit of the girl group LOOΠΔ. They debuted with members Yves, Chuu, Go Won, and Olivia Hye on May 30, 2018 with the mini-album beauty&thebeat.

09. Yves (이브): born in May 1997. Introduced in November 2017. Her animal is a swan and her colour is burgundy. She is the unit's leader.

10. Chuu (츄): born in October 1999. Introduced in December 2017. Her animal is a penguin and her colour is peach.

11. Go Won (고원): born in November 2000. Introduced in January 2018. Her animal is a butterfly and her colour is eden green.

12. Olivia Hye (올리비아혜): born in November 2001. Introduced in March 2018. Her animal is a wolf and her colour is black/grey.