Loona 1/3

Loona 1/3
From left to right: HaSeul, ViVi, HyunJin, and HeeJin
Background information
Origin	South Korea
Genres	K-pop bubblegum pop
Years active	2017
Labels	Blockberry Creative
Spinoff of	Loona
Members	HaSeul HeeJin HyunJin ViVi
Korean name
Hangul	이달의 소녀 1/3
Hanja	이달의少女 1/3
Revised Romanization	Idarui Sonyeo 1/3
McCune–Reischauer	Idarŭi Sonyŏ 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.