B.A.P - September 5
TS Entertainment announced on July 6 that B.A.P would be making a mid-August comeback. The group revealed their first comeback teaser on August 11, however it wasn't until August 22 that the group released any sort of definite details about the comeback. The comeback schedule confirmed that the group would be making an early September comeback, instead of an August comeback like originally announced. Individual teaser photos for Yongguk, Himchan, and Youngjae were revealed on August 23, with Daehyun's, Jongup's, and Zelo's being released the next day. The first group photo was then released on August 25, followed by two album cover images and two more group photos on August 28. The first trailer video was released on August 29, followed by a second trailer video on September 1.
EXO - September 5
SM Entertainment announced that EXO would be making another comeback just two months after they released "Ko Ko Bop." They first teaser for their comeback was released on August 22, playing off of the total solar eclipse that was taking place. It wasn't until the second teaser was released on August 29, however, that fans got any clue at what the comeback concept would be. It wasn't until the third teaser was released on August 30 that the group revealed they would be coming back on September 5. Since then, individual teaser GIFs have slowly been revealed (Kai, Sehun, Chen, Xiumin, Baekhyun, Chanyeol, Suho, and D.O.), as well as duo photos (Kai/Sehun, Chen/Xiumin, Baekhyun/Chanyeol, and Suho/D.O.). The group then released the album cover artwork on September 4, followed by a music video teaser later that day. The poster artwork was revealed on September 5, just before the release of the music video.
Check out our full review of their comeback.
Pentagon - September 6
Cube Entertainment's newest boy group announced their comeback via a teaser image released on August 25. Their comeback schedule was revealed on August 28, showing a packed schedule of teasers leading up to their September 6 reveal. On August 29, the group revealed individual teasers for all 10 members (Jinho, Hui, Hongseok, E'Dawn, Shinwon, Yeo One, Yan An, Yuto, Kino, and Wooseok), as well as the first group teaser image. They released a second set of individual teaser images, as well as another group teaser image, the next day. The album's track list was revealed on September 1, with album details coming out later the same day. The group then released a short film on September 2. An audio snippet video was released on September 4, followed by a music video teaser the next day. A second teaser was revealed on September 6.
MXM - September 6
After releasing two preview tracks at the end of July, Brand New Music's popular subunit announced in August that they would make their long-awaited debut at the beginning of September. Several image teasers were released on their Twitter account, as well as individual teaser videos for Youngmin and Donghyun, a teaser clip for their debut track "I'm the One," and an album preview.
G.Soul - September 7
The former JYP Entertainment artist announced on August 28 that he would be making a September comeback. G.Soul's new agency, Jay Park's H1GHR MUSIC, released a teaser image, as well as the name of his comeback album. CIRCLES. A second teaser image was revealed on August 31, then an album preview video on September 3, a music video teaser on September 5, and a second music video teaser and a final teaser photo on September 6.
Check out our full review of his comeback.
Junho - September 11
On August 31, JYP Entertainment artists and 2PM member Junho announced he would be making a solo comeback via a teaser image, revealing the name of his album, CANVAS. His comeback schedule and track list were also revealed that day. He then revealed two teaser images on September 6, followed by two more the next day. The teaser video for his comeback was released on September 10.
GFRIEND - September 13
The ultra-popular girl group revealed on August 31 that they would be coming back just a month after they released "Love Whisper" with a repackaged version of their fifth mini album, Parallel. GFRIEND announced the comeback with a set of individual teaser photos. The track list was revealed the following day, then a mood teaser video on September 2. Full sets of individual teasers for each member (Sowon, Yerin, Eunha, Yuju, SinB, and Umji) were released starting September 3, followed by a music video teaser on September 7 and a set of group teaser photos on September 8. The group then released a second music video teaser on September 11. The group wrapped up their teasers with a highlight medley on September 12.
ELRIS - September 13
Hunus Entertainment's newest girl group started teasing their comeback on August 29 with a cryptic teaser image. However, it wasn't until September 1 that ELRIS released individual teaser images (Sohee, Bella, Hyeseong, Yukyung, and Karin) and a group teaser image. The group then released the album's track list on September 4, as well as announced the date of their comeback. A few minutes later, the group revealed another set of individual (Sohee, Bella, Hyeseong, Yukyung, and Karin) and group teaser photos. Physical album details were released on September 5, followed by a spoiler video on September 7. The music video teaser was released on September 11.
BTS - September 18
Even thought BigHit Entertainment announced the official date of BTS' comeback on August 24, fans have known a comeback is coming for a while now. The company even began releasing concept images as early as August 11, keeping fans wondering until the very last minute. Each member got an individual concept photo (Jungkook, Suga, Jimin, Rap Monster, V, J-Hope, and Jin) and six of them got a duo teaser (Jungkook/Suga, Jimin/J-Hope, and Rap Monster/V). The pairings left Jin as the only one to get a second solo teaser. The group also released four lengthy concept videos (起, 承, 轉, and 起承轉結) before announcing their comeback date.
The group then released their comeback trailer on September 5, then four sets of concept photos: L version, O version, V version, and E version. The album's track list was revealed on September 13, followed by the first music video teaser for their title track "DNA" two days later. A second music video teaser was released on September 16.
Check out our full review of their comeback.
APRIL - September 20
The DSP Media girl group started teasing their upcoming comeback on September 6 with a teaser image revealing the date and album name, and their teaser schedule was released later that day. The first set of individual teaser photos (Chaekyung, Chaewon, Naeun, Yena, Rachel, and Jinsol) was shared on September 7, followed by two trio shots on September 9. APRIL revealed the album track list on September 10. Individual teaser films (Chaekyung, Chaewon, Naeun, Yena, Rachel, and Jinsol) were shared starting September 11, followed by the first full group photo and album user guide on September 13. More individual and trio shots were shared on September 14 and September 15. Another group photo was shared on September 16, followed by individual "moving posters" (Chaekyung, Chaewon, Naeun, Yena, Rachel, and Jinsol) on September 17. The group finally revealed their first music video teaser on September 18, followed by a dance preview on September 19.
B1A4 - September 25
A source from WM Entertainment confirmed on September 7 that the group is scheduled to make a comeback later in the month. On September 17, B1A4 revealed their teaser schedule, revealing their comeback date and album name. They then revealed three group teaser images, a black version, gray version, and blue version, on September 18. The next day, they released the album's track list and physical details, as well as information on their upcoming pop-up store and exhibition.
While no official date has been announced yet, Fave Entertainment announced on September 1 that IU would be making a mid-September comeback with her new album, Flower Bookmark 2.
YG Entertainment confirmed on August 20 that Lee Hi would be making her first comeback in a year and a half in September.
A source from YG Entertainment confirmed in late August that veteran group SECHSKIES would be making a comeback with two new music videos in September. While no date has been announced, their 20th anniversary is September 23, so there is lots of speculation that they will make a comeback later in the month.