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* {{cite web|last=Son|first=Ye-ji|url=http://tenasia.hankyung.com/archives/1077919|title=이달의 소녀, 하슬 공개.. 톰보이 매력|publisher=Ten Asia|language=ko|date=December 8, 2016|access-date=2017-09-21|archive-date=2017-07-28|archive-url=https://web.archive.org/web/20170728204146/http://tenasia.hankyung.com/archives/1077919|dead-url=yes}}
* {{cite web|last=Son|first=Ye-ji|url=http://tenasia.hankyung.com/archives/1102324|title=이달의 소녀, 4번째 주인공 여진.. 15세 발랄 상큼소녀|publisher=Ten Asia|language=ko|date=January 4, 2017|access-date=2017-09-21|archive-date=2017-07-28|archive-url=https://web.archive.org/web/20170728204649/http://tenasia.hankyung.com/archives/1102324|dead-url=yes}}
* {{
* {{cite web|last=Yoon|first=Joon-pil|url=http://tenasia.hankyung.com/archives/1134800|title=이달의 소녀, 5번째 멤버 '비비'+첫 유닛 티저 공개 '기대감UP'|publisher=Ten Asia|language=ko|date=February 13, 2017|access-date=2017-09-21|archive-date=2017-07-28|archive-url=https://web.archive.org/web/20170728204653/http://tenasia.hankyung.com/archives/1134800|dead-url=yes}}</ref> Pada Maret 2017, subunit pertama mereka, [[Loona 1/3]], diperkenalkan, dengan anggota yang sebelumnya telah diungkap HeeJin, HyunJin, HaSeul dan anggota baru, ViVi.<ref>{{cite web|last=Son|first=Ye-ji|url=http://tenasia.hankyung.com/archives/1152118|title='데뷔 임박' 이달의 소녀 1/3, 지상파 광고 돌입… "이례적"|publisher=Ten Asia|language=ko|date=March 6, 2017|access-date=2017-08-21|archive-date=2017-03-06|archive-url=https://web.archive.org/web/20170306022829/http://tenasia.hankyung.com/archives/1152118|dead-url=yes}}</ref> [[Loona 1/3]] merilis album mini ''[[Love & Live]]'' dengan singel utama dengan judul yang sama pada 13 Maret 2017,<ref>{{cite web|last=Son|first=Ye-ji|url=http://tenasia.hankyung.com/archives/1157969|title=이달의 소녀 1/3, 오늘(13일) 베일 벗는다|publisher=Ten Asia|language=ko|date=March 13, 2017|access-date=2017-08-21|archive-date=2017-03-13|archive-url=https://web.archive.org/web/20170313082436/http://tenasia.hankyung.com/archives/1157969|dead-url=yes}}</ref> dan memulai promosi di [[Seoul Broadcasting System|SBS]] ''[[Inkigayo]]'',<ref>{{cite web|last=Yang|first=Jin-young|url=http://www.newspim.com/news/view/20170216000207|title='이달의 소녀 1/3', 3월 10일 유닛 앨범 발표…비비 포함 4인조로 첫 활동|publisher=News Pim|language=ko|date=February 16, 2017}}</ref> Pada 27 April, mereka merilis edisi rilis ulang dari album mini tersebut, berjudul ''[[Love & Live|Love & Evil]]'', dengan singel utama "Sonatine".<ref>{{cite web|last=Park|first=Seul-gi|url=http://tenasia.hankyung.com/archives/1195931|title=이달의 소녀 1/3, 리패키지 앨범 'love&Evil' 오늘(27일) 발매|publisher=Ten Asia|language=ko|date=April 27, 2017|access-date=2017-08-21|archive-date=2017-08-21|archive-url=https://web.archive.org/web/20170821043416/http://tenasia.hankyung.com/archives/1195931|dead-url=yes}}</ref> ''Love & Live'' berada di peringkat ke-10, sementara ''Love & Evil'' berada di peringkat ke-24 di [[Gaon Album Chart]].<ref>{{cite web|url=http://gaonchart.co.kr/main/section/chart/album.gaon?nationGbn=T&serviceGbn=&targetTime=11&hitYear=2017&termGbn=week|title=2017년 11주차 Album Chart|publisher=[[Gaon Music Chart|Gaon Chart]]|language=ko}}</ref><ref>{{cite web|url=http://gaonchart.co.kr/main/section/chart/album.gaon?nationGbn=T&serviceGbn=&targetTime=17&hitYear=2017&termGbn=week|title=2017년 17주차 Album Chart|publisher=[[Gaon Music Chart|Gaon Chart]]|language=ko}}</ref>
[[File:171102 엠카 미니팬미팅 이달의소녀 오드아이써클 직찍.jpg|thumb|left|[[Loona Odd Eye Circle]] pada November 2017]]
Sejak April 2017 hingga Juli 2017, ViVi, Kim Lip, JinSoul, dan Choerry merilis album singel mereka, dengan melanjutkan pola ''Girl of the Month'' yang sama.<ref>* {{cite web|last=Yoon|first=Joon-pil|url=http://tenasia.hankyung.com/archives/1178474|title=이달의 소녀 비비, 5번째 솔로 앨범 주인공 낙점…MV 촬영지 '궁금증 UP'|publisher=Ten Asia|language=ko|date=April 5, 2017|access-date=2017-08-21|archive-date=2019-09-04|archive-url=https://web.archive.org/web/20190904115811/http://tenasia.hankyung.com/archives/1178474|dead-url=yes}}
* {{cite web|last=Park|first=Seul-gi|url=http://tenasia.hankyung.com/archives/1208459|title=이달의 소녀, 여섯 번째 멤버 김립 공개 "NEW 빌드업 소녀"|publisher=Ten Asia|language=ko|date=May 15, 2017|access-date=2017-09-21|archive-date=2019-09-04|archive-url=https://web.archive.org/web/20190904115811/http://tenasia.hankyung.com/archives/1208459|dead-url=yes}}
* {{cite web|last=Yoon|first=Joon-pil|url=http://tenasia.hankyung.com/archives/1231693|title=이달의 소녀, 7번째 멤버 진솔 공개…'男心홀릭' 여신 비주얼|publisher=Ten Asia|language=ko|date=June 13, 2017|access-date=2017-09-21|archive-date=2017-06-13|archive-url=https://web.archive.org/web/20170613061350/http://tenasia.hankyung.com/archives/1231693|dead-url=yes}}
* {{cite web|last=Yoon|first=Joon-pil|url=http://tenasia.hankyung.com/archives/1253167|title=이달의 소녀, 8번째 멤버 최리 공개…우아한 걸크러시|publisher=Ten Asia|language=ko|date=July 12, 2017|access-date=2017-09-21|archive-date=2017-07-28|archive-url=https://web.archive.org/web/20170728120400/http://tenasia.hankyung.com/archives/1253167|dead-url=yes}}</ref> Pada September 2017, tiga anggota (HeeJin, HyunJin dan HaSeul), mengikuti audisi untuk acara realitas [[JTBC]] ''[[Mix Nine]]''; HeeJin dan HyunJin berhasil lolos tahap audisi dan tampil di acara tersebut,<ref>{{cite news |last=Choi |first=Ji-ye |title= 양현석X한동철 '믹스나인' 첫 주자, 드디어 베일 벗었다 |url= http://entertain.naver.com/read?oid=117&aid=0002957702 |website= Naver |publisher= My Daily |access-date= September 30, 2017 |language=ko}}</ref> di mana HyunJin lolos hingga Top 18 dan HeeJin menempati posisi ke-4 di final.<ref>{{cite news |last=Choi |first=So-young |title= '믹스나인' 女신류진·男우진영 1등, 데뷔는 소년팀 |url= http://star.mt.co.kr/stview.php?no=2018012701100515430&outlink=1&ref=https%3A%2F%2Fsearch.naver.com |website=Star News|publisher= My Daily |access-date= January 26, 2018 |language=ko}}</ref> Subunit kedua mereka, [[Loona Odd Eye Circle]], beranggotakan JinSoul, Kim Lip dan Choerry, merilis album mini ''[[Mix & Match]]'' dengan singel utama "Girl Front" pada 21 September 2017, dan memulai promosi di [[Mnet]] ''[[M Countdown]]''.<ref>{{cite web|last=Han|first=Je-hoon|url=http://www.lunarglobalstar.com/news/articleView.html?idxno=11079|title='이달의 소녀 2nd 유닛' 오드아이써클, 21일 '믹스 앤 매치' 발매|publisher=Lunar Global Star|language=ko|date=September 18, 2017|access-date=2017-09-21|archive-date=2017-09-21|archive-url=https://web.archive.org/web/20170921192737/http://www.lunarglobalstar.com/news/articleView.html?idxno=11079|dead-url=yes}}</ref> Versi Bahasa Inggris dari lagu "Loonatic" dirilis pada 23 Oktober.<ref>{{cite web|last=Geum|first=Bit-na|url=http://www.sedaily.com/NewsView/1OMDL1XASE|title=이달의 소녀 두 번째 유닛 오드아이써클, 'LOONATIC' 영어 버전 앨범 발매|publisher=Seoul Economy|language=ko|date=October 19, 2017}}</ref> Pada 31 Oktober, mereka merilis edisi rilis ulang dari album mini tersebut, berjudul ''[[Mix & Match|Max & Match]]'', dengan tambahan tiga lagu baru termasuk singel "Sweet Crazy Love".<ref>{{cite web|last=Choi|first=Ji-ye|url=http://www.mydaily.co.kr/new_yk/html/read.php?newsid=201710190851846328&ext=na|title=이달소 오드아이써클, 신곡 추가해 31일 리패키지 앨범 발매|publisher=My Daily|language=ko}}</ref> ''Mix & Match'' berada di peringkat ke-16, sementara ''Max & Match'' berada di peringkat ke-7 di Gaon Album Chart.<ref>{{cite web|title=Gaon Album Chart – Week 38, 2017|url=http://gaonchart.co.kr/main/section/chart/album.gaon?nationGbn=T&serviceGbn=&targetTime=38&hitYear=2017&termGbn=week|website=[[Gaon Music Chart|Gaon Chart]] |language=ko |access-date=September 28, 2017}}</ref><ref>{{cite web|title=Gaon Album Chart – Week 44, 2017|url=http://gaonchart.co.kr/main/section/chart/album.gaon?nationGbn=T&serviceGbn=&targetTime=44&hitYear=2017&termGbn=week|website=[[Gaon Music Chart|Gaon Chart]] |language=ko |access-date=January 16, 2020}}</ref>
[[File:180902 스카이페스티벌 이달의 소녀 yyxy.jpg|thumb|right|240px|[[yyxy|Loona yyxy]] pada September 2018]]
Sejak November 2017 hingga Januari 2018, mereka merilis album singel untuk anggota baru Yves, Chuu, dan Go Won, melanjutkan pola bulanan yang sama bersamaan dengan singel digital "The Carol 2.0" yang dinyanyikan oleh Yves, Vivi, dan Choerry.<ref>* {{cite web |last= 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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