Loona 1/3

Loona 1/3 (commonly stylized in all caps or LOOΠΔ 1/3) is the first sub-unit of South Korean girl group Loona, formed through a pre-debut project titled "Girl of the Month". The unit consists of four members: Heejin, Hyunjin, Haseul, and Vivi. They debuted on March 13, 2017, with the extended play Love & Live.