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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.

History

Pre-debut: Revealing of the first three members

The first member to be revealed is HeeJin on September 26, 2016. She debuted with her single album HeeJin with the title track "ViViD" on October 5. On October 28, HyunJin was revealed to be the second member. She debuted with her solo album titled HyunJin and the title track "Around You" on November 18. A duet between her and HeeJin, titled "I'll Be There", was also released, along with a music video. The next member, HaSeul, was revealed on December 8. She debuted through her single album of the same name HaSeul with the title track "Let Me In", released on December 15. Another track titled "The Carol" was released as well, with the three revealed members HeeJin, HyunJin and HaSeul.

2017: Debut with Love & Live, ViVi solo album, and Love & Evil

On March 12, 2017, The sub-unit made their first live appearance on SBS's Inkigayo, performing both "You and Me Together" and "Love&Live". A day later, on March 13, they officially debuted with the release of their extended play Love & Live, featuring HeeJin, HyunJin, HaSeul and ViVi. On April 5, ViVi was officially revealed as the fifth member of Loona. Then, she released a solo album named ViVi with the title track "Everyday I Love You", featuring HaSeul, on April 17. The sub-unit supposedly cost 4 million dollars to produce, with the music video for their title track being filmed in New Zealand and Hong Kong.

A reissue of their extended play 'Love & Live, titled Love & Evil was released on April 27 with the addition of two tracks and the new lead single "Sonatine".

Members

• HaSeul (하슬) (Leader)
• HeeJin (희진)
• HyunJin (현진)
• ViVi (비비)

Discography

Extended plays

Reissues

Singles

Videography

Music videos

References

1. Jeong, Ji-won (September 26, 2016). "신개념 걸그룹 프로젝트 '이달의 소녀' 첫 선…희진 공개". X Sports News (in Korean). Retrieved January 20, 2021.
2. Kim, Sang-min (October 5, 2016). "'이달의 소녀' 희진, 데뷔곡 '비비드(ViViD)' 오늘(5일) 자정 공개". Sedaily (in Korean). Retrieved January 4, 2021.
3. Bae, Hyo-ju (November 17, 2016). "걸그룹 이달의 소녀 두번째 멤버 현진 공개 "동양미와 청순미가 매력"". Newsen (in Korean). Retrieved January 20, 2021.
4. Kim, Young-rok (November 17, 2016). "'이달의소녀' 현진, 17일 신곡 '다녀가요'-'I'll be there' 동시 발매". Sports Chosun (in Korean). Retrieved January 7, 2021.
5. Kim, Young-rok (November 17, 2016). "'이달의소녀' 현진, 17일 신곡 '다녀가요'-'I'll be there' 동시 발매". Sports Chosun (in Korean). Retrieved January 7, 2021.
6. Son, Hye-ji (December 8, 2016). "이달의 소녀, 하슬 공개.. 톰보이 매력". Ten Asia (in Korean). Retrieved January 20, 2021.
7. Moon, Kyoung-min (December 15, 2016). "걸그룹 이달의 소녀 '하슬', 솔로곡 '소년,소녀' 베일 벗었다...'블록버스터 트랙'". Sedaily (in Korean). Retrieved January 7, 2021.
8. Kim, Min-kyoung (December 14, 2016). "걸그룹 '이달의 소녀', 크리스마스 '더 캐롤' 뮤직비디오 티저 공개". Munhwa (in Korean). Retrieved January 7, 2021.
9. Jeon, Jong-seon (March 13, 2017). "'인기가요' 이달의 소녀 1/3, 쯔위 닮은꼴 현진…데뷔 무대서 '눈길'". Sedaily (in Korean). Retrieved January 4, 2021.
10. Son, Ye-ji (March 13, 2017). "'이달의 소녀 1/3, 오늘(13일) 베일 벗는다". Ten Asia (in Korean). Retrieved January 4, 2021.
11. Yun, Jun-pil (April 5, 2016). "이달의 소녀 비비, 5번째 솔로 앨범 주인공 낙점...MV 촬영지 '궁금증 UP'". Ten Asia (in Korean). Retrieved January 20, 2021.
12. Hwang, Hye-jin (April 17, 2017). "이달의 소녀 비비, 솔로 싱글 음원 MV 공개" (in Korean). Newsen. Retrieved January 7, 2021.
13. Kim, Eun-goo (October 8, 2016). "'이달의 소녀' 첫 멤버 희진". Star In (in Korean). Retrieved January 7, 2021.
14. Park, Seul-gi (April 27, 2017). "이달의 소녀 1/3, 리패키지 앨범 'love&Evil' 오늘(27일) 발매". Ten Asia (in Korean). Retrieved January 7, 2021.
15. "2017년 11주차 Album Chart". March 18, 2017.
16. Cumulative sales of Mix & Match:
    • "2017년 03월 Album Chart" [March 2017 Album Chart]. Gaon Music Chart.
    • "2020년 04월 Album Chart" [April 2020 Album Chart]. Gaon Music Chart.
17. "2020년 17주차 Album Chart". April 25, 2020.
18. "Loona Chart History: World Albums". Billboard. Retrieved August 28, 2018.
19. Cumulative sales of Max & Match:
    • "2017년 04월 Album Chart" [April 2017 Album Chart (see #65 & #78)]. Gaon Music Chart.
    • "2020년 04월 Album Chart" [April 2020 Album Chart (see #65 & #78)]. Gaon Music Chart.
20. Love & Live (photobook). LOOΠΔ 1/3. South Korea: CJ E&M. 2017. Credits.{{cite AV media notes}}: CS1 maint: others in cite AV media (notes) (link)
21. [MV] 이달의 소녀 1/3 (LOONA 1/3) "You and Me Together" (Special MV), archived from the original on 2020-06-26, retrieved 2019-12-24
22. Love & Evil Repackage (photobook). LOOΠΔ 1/3. South Korea: CJ E&M. 2017. Credits.{{cite AV media notes}}: CS1 maint: others in cite AV media (notes) (link)

• Loona (group)
• Musical groups established in 2017
• 2017 establishments in South Korea