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== Riwayat ==
=== 2016–2018: Proyek pra-debut dan ''Mix Nine'' ===
Pada 7 Agustus 2018, Loona merilis singel digital pradebut "[[Favorite (lagu Loona)|Favorite]]", lagu pertama mereka yang menampilkan kedua belas anggota,<ref>{{Citation|title=favOriTe – Single by LOOΠΔ|date=August 7, 2018|url=https://itunes.apple.com/us/album/favorite-single/1423049627|language=en-US|access-date=August 8, 2018|archive-date=August 8, 2018|archive-url=https://web.archive.org/web/20180808080258/https://itunes.apple.com/us/album/favorite-single/1423049627|url- status=live}}</ref> disertai dengan sebuah video musik yang berfokus pada koreografi. Singel pradebut tersebut kemudian terungkap sebagai lagu di album mini debut ''[+ +]''.<ref>{{Cite news|last=Herman|first=Tamar|url=https://www.billboard.com/articles/columns/k-town/8469128/loona-favorite-music-video-first-single|title=K-Pop Girl Group Loona Releases First Single as Full Act: Watch 'favOriTe' Music Video|work=Billboard|access-date=August 8, 2018|archive-date=June 6, 2019|archive-url=https://web.archive.org/web/20190606114325/https://www.billboard.com/articles/columns/k-town/8469128/loona-favorite-music-video-first-single|url-status=live}}</ref> ▼ Choi |first= Jeong-min |url= https://tenasia.hankyung.com/topic/article/2017112878654 |title= 이달의 소녀 이브, 솔로 앨범 공개… "변화 이끌 것" |publisher= Ten Asia |language= ko |date= November 30, 2017 }}
* {{cite web |last= Choi |first= Jeong-min |url= http://tenasia.hankyung.com/archives/1381359 |title= 이달의 소녀 열 번째 멤버 '츄', '하트 어택' 음원+뮤비 공개 |publisher= Ten Asia |language= ko |date= December 28, 2017 |access-date= 2018-01-02 |archive-date= 2017-12-29 |archive-url= https://web.archive.org/web/20171229052244/http://tenasia.hankyung.com/archives/1381359 |dead-url= yes }}
* {{cite web |last= Yoon |first= Joon-pil |url= http://tenasia.hankyung.com/archives/1412319 |title= 이달의 소녀 11번째 멤버 고원, 솔로 싱글 오늘(30일) 정오 공개 |publisher= Ten Asia |language= ko |date= January 30, 2018 |access-date= 2018-03-24 |archive-date= 2019-09-04 |archive-url= https://web.archive.org/web/20190904115815/http://tenasia.hankyung.com/archives/1412319 |dead-url= yes }}
* {{cite web |title=The Carol 2.0 (ViVi, Choerry, Yves) by LOOΠΔ on iTunes |url=https://itunes.apple.com/us/album/the-carol-2-0-vivi-최리-이브/1324870367 |website=[[iTunes Store]] |publisher=[[Apple Inc.]] |location=United States |date=December 13, 2017 }}</ref> Pada Maret 2018, mereka merilis album singel untuk anggota terakhir, Olivia Hye.<ref>{{cite web |last= Kim |first= Su-kyeong |url= http://tenasia.hankyung.com/archives/1456229 |title= 이달의 소녀 올리비아 혜, 솔로 싱글 티저 공개...자아를 말한다 |publisher= Ten Asia |language= ko |date= March 28, 2018 |access-date= 2021-05-04 |archive-date= 2018-08-27 |archive-url= https://web.archive.org/web/20180827205933/http://tenasia.hankyung.com/archives/1456229 |dead-url= yes }}</ref> Pada 30 Mei 2018, subunit ketiga mereka, [[Yyxy|Loona yyxy]], debut dengan album mini ''[[Beauty & the Beat]]''. Singel utama "love4eva" (feat. Grimes) dirilis pada hari yang sama bersama dengan video musik untuk lagu tersebut.<ref>{{cite web|last=Kim|first=Ji-won|url=http://tenasia.hankyung.com/archives/1503036|title=이달의 소녀 yyxy, 30일 데뷔…내달 팬미팅서 신곡 무대|publisher=Ten Asia|language=ko|date=May 30, 2018|access-date=2018-06-06|archive-date=2018-06-07|archive-url=https://web.archive.org/web/20180607213526/http://tenasia.hankyung.com/archives/1503036|dead-url=yes}}</ref> Album mini tersebut berada di peringkat ke-4 di Gaon Album Chart.<ref>{{cite web|url=http://gaonchart.co.kr/main/section/chart/album.gaon?nationGbn=T&serviceGbn=&targetTime=22&hitYear=2018&termGbn=week|title=Gaon Album Chart – Week 22, 2018|website=[[Gaon Music Chart|Gaon Chart]] |language=ko |access-date=June 8, 2018}}</ref>
▲Pada 7 Agustus 2018, Loona merilis singel digital pradebut "[[Favorite (lagu Loona)|Favorite]]", lagu pertama mereka yang menampilkan kedua belas anggota,<ref>{{Citation|title=favOriTe – Single by LOOΠΔ|date=August 7, 2018|url=https://itunes.apple.com/us/album/favorite-single/1423049627|language=en-US|access-date=August 8, 2018|archive-date=August 8, 2018|archive-url=https://web.archive.org/web/20180808080258/https://itunes.apple.com/us/album/favorite-single/1423049627|url-status=live}}</ref> disertai dengan sebuah video musik yang berfokus pada koreografi. Singel pradebut tersebut kemudian terungkap sebagai lagu di album mini debut ''[+ +]''.<ref>{{Cite news|last=Herman|first=Tamar|url=https://www.billboard.com/articles/columns/k-town/8469128/loona-favorite-music-video-first-single|title=K-Pop Girl Group Loona Releases First Single as Full Act: Watch 'favOriTe' Music Video|work=Billboard|access-date=August 8, 2018|archive-date=June 6, 2019|archive-url=https://web.archive.org/web/20190606114325/https://www.billboard.com/articles/columns/k-town/8469128/loona-favorite-music-video-first-single|url-status=live}}</ref>
=== 2018–2019: Debut dengan ''[+ +]'' dan ''[X X]'' ===
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