The Twitter account @koreansales_twt compiled a list of the top 10 best-selling K-pop boy group albums in the GAON music charts from January to September 2021. While there are some surprise entries, BTS expectedly claims the number one spot in it.There's a whopping difference of six million sales between the first spot and the last spot. Considering BTS only released one single in 2021, Butter, K-netizens are stunned by their immense power.Who are GAON's Top 10 best-selling K-pop boy groups from January to September 2021?KOREAN SALES@koreansales_twtBest-selling Boy Group in 202101. #BTS — 6,263,32902. #NCTDREAM — 3,819,97003. #NCT127 — 2,690,94304. #TXT — 1,837,40005. #StrayKids — 1,753,62706. #SEVENTEEN — 1,690,52807. #EXO — 1,495,49708. #ATEEZ — 1,417,57409. #ENHYPEN — 882,75010. #THEBOYZ — 787,685 twitter.com/koreansales_tw…KOREAN SALES@koreansales_twtBest-selling Boy Group in 202101. #BTS — 5,699,95402. #NCTDREAM — 3,801,64103. #TXT — 1,735,75304. #SEVENTEEN — 1,665,70905. #StrayKids — 1,604,39006. #EXO — 1,490,08707. #ENHYPEN — 822,33308. #THEBOYZ — 758,92709. #NCT — 740,64110. #ASTRO — 716,535 twitter.com/koreansales_tw…10:05 AM · Oct 7, 202121281250Best-selling Boy Group in 202101. #BTS — 5,699,95402. #NCTDREAM — 3,801,64103. #TXT — 1,735,75304. #SEVENTEEN — 1,665,70905. #StrayKids — 1,604,39006. #EXO — 1,490,08707. #ENHYPEN — 822,33308. #THEBOYZ — 758,92709. #NCT — 740,64110. #ASTRO — 716,535 twitter.com/koreansales_tw…1:49 AM · Oct 11, 2018Best-selling Boy Group in 202101. #BTS — 6,263,32902. #NCTDREAM — 3,819,97003. #NCT127 — 2,690,94304. #TXT — 1,837,40005. #StrayKids — 1,753,62706. #SEVENTEEN — 1,690,52807. #EXO — 1,495,49708. #ATEEZ — 1,417,57409. #ENHYPEN — 882,75010. #THEBOYZ — 787,685 twitter.com/koreansales_tw…The 'KOREAN SALES' Twitter account is a regular for K-pop stans as it regularly updates them about everything in the K-pop industry. Whether it's digital and physical sales, streaming details (hourly, daily and monthly) of Korean music charts or Spotify rankings, @koreansales_twt has it all.The K-pop industry is big on physical album sales and GAON is one of the major charts that helps track them. Here's a look at the groups that have recorded the highest number of album sales in 2021 so far.10) THE BOYZ - 787,685 View this post on Instagram A post shared by 더보이즈(THE BOYZ) (@official_theboyz)First up is the rookie group, THE BOYZ. The group released their sixth mini-album THRILL-ING in August. The album also went on to break its previous first-week sales record with their 2020 album CHASE.9) ENHYPEN - 882,750 View this post on Instagram A post shared by — ENHYPEN Daily (@enhypenenthusiast)Belift Lab's much-loved boy group ENHYPEN, lands up in ninth place with 882k sales. The group released BORDER:CARNIVAL in April. After a COVID health scare, they're currently prepping for their comeback in October.8) ATEEZ - 1,417,574ATEEZ(에이티즈)@ATEEZofficial[🎬] ATEEZ(에이티즈) - ‘Eternal Sunshine’ Official MV youtu.be/WJgTnDAmJHc #FEVER_Part_3 #Eternal_Sunshine #ATEEZ #에이티즈8:30 AM · Oct 3, 20219091034087[🎬] ATEEZ(에이티즈) - ‘Eternal Sunshine’ Official MV youtu.be/WJgTnDAmJHc #FEVER_Part_3 #Eternal_Sunshine #ATEEZ #에이티즈 https://t.co/T7U1gRO440One of the most powerful 4th generation K-pop groups soaring to popularity, ATEEZ claimed eighth place, close to 1.45 million copies. Their eighth EP titled Zero: Fever Part 3 was released in September.7) EXO - 1,495,497EXO@weareoneEXOEXO 엑소 Special Album [DON'T FIGHT THE FEELING]🎧 2021.06.07. 6PM KST#엑소 #EXO #weareoneEXO#DONT_FIGHT_THE_FEELING8:30 AM · May 22, 2021392806212145EXO 엑소 Special Album [DON'T FIGHT THE FEELING]🎧 2021.06.07. 6PM KST#엑소 #EXO #weareoneEXO#DONT_FIGHT_THE_FEELING https://t.co/32kzgX0aVKThe 3rd generation K-pop superstars landed in seventh place with 1.49 million copies. In June, the group made their seven-member comeback with Don't Fight The Feeling and a refreshing new retro game concept complete with graphic cards and an 80s-inspired space video game.6) SEVENTEEN - 1,690,528세븐틴(SEVENTEEN)@pledis_17SEVENTEEN (세븐틴) 9th Mini Album 'Attacca'Concept Trailer : Rush of Love▶ youtu.be/ANeA74wyT0I🎼2021.10.22 1PM (KST)🎼2021.10.22 0AM (ET)#세븐틴 #SEVENTEEN#Attacca#세븐틴_컴백_가보자는거야8:30 AM · Sep 28, 2021228377108795SEVENTEEN (세븐틴) 9th Mini Album 'Attacca'Concept Trailer : Rush of Love▶ youtu.be/ANeA74wyT0I🎼2021.10.22 1PM (KST)🎼2021.10.22 0AM (ET)#세븐틴 #SEVENTEEN#Attacca#세븐틴_컴백_가보자는거야 https://t.co/sQLqgdMMcjAnother self-producing group up on the list, K-pop group SEVENTEEN takes sixth place as one of the best-selling male groups in 2021. Their eighth mini-album Your Choice was released in June. The group is now prepping for their ninth mini-album, ATTACA.5) Stray Kids - 1,753,627Stray Kids@Stray_KidsStray Kids(스트레이 키즈) "소리꾼" M/Vyoutu.be/EaswWiwMVs8#StrayKids #스트레이키즈#NOEASY#소리꾼 #Thunderous#StrayKidsComeback#YouMakeStrayKidsStay2:30 AM · Aug 23, 2021299302117905Stray Kids(스트레이 키즈) "소리꾼" M/Vyoutu.be/EaswWiwMVs8#StrayKids #스트레이키즈#NOEASY#소리꾼 #Thunderous#StrayKidsComeback#YouMakeStrayKidsStay https://t.co/FpUbKsqfH9JYP's self-producing group Stray Kids ranks number five on the list. NOEASY is their second full-length album consisting of 14 songs ranging from hip hop to R&B and more. They have sold 1.7 million copies so far in 20214) TXT - 1,837,400BIGHIT MUSIC@BIGHIT_MUSICThe Chaos Chapter: FREEZE - Concept Photo 'WORLD'🗺 bit.ly/3y71Ggq#투모로우바이투게더 #TOMORROW_X_TOGETHER #TXT#TheChaosChapter #TXT_FREEZE8:30 AM · May 15, 2021501555119439The Chaos Chapter: FREEZE - Concept Photo 'WORLD'🗺 bit.ly/3y71Ggq#투모로우바이투게더 #TOMORROW_X_TOGETHER #TXT#TheChaosChapter #TXT_FREEZE https://t.co/rMCKrKTV3vTaking up the fourth rank is HYBE's boy group TOMORROW X TOGETHER. The five-member group released their second studio album, The Chaos Chapter: Freeze, on May 31, 2021. It became the highest-charting album in 2021 by a K-pop act on the Billboard 200 chart. The group then released a repackaged album, The Chaos Chapter: FIGHT OR ESCAPE in August. They're now gearing up for a Japanese release.3) NCT 127 - 2,690,943NCT 127@NCTsmtown_127NCT 127 'Sticker' Comeback Stage➫ 2021.09.17 10PM (KST)➫ youtube.com/nct127#NCT127 #Sticker #NCT127_Sticker3:05 AM · Sep 17, 202112703754144NCT 127 'Sticker' Comeback Stage➫ 2021.09.17 10PM (KST)➫ youtube.com/nct127#NCT127 #Sticker #NCT127_Sticker https://t.co/zVCpKhvfENUp close is their fellow sub-unit, NCT 127. The group has sold 2.69 million copies collectively so far in 2021. This is an incredible feat considering the group only released Sticker, their third studio album, and achieved a 'Double Million Seller' label with it.2) NCT Dream - 3,819,970NCT DREAM@NCTsmtown_DREAMDREAM AND LET DREAMNCT DREAM The 1st Album Repackage ⠀〖Hello Future〗⠀➫ 2021.06.28 (KST)#NCTDREAM #HelloFuture#NCTDREAM_HelloFuture8:30 AM · Jun 18, 2021261201130321DREAM AND LET DREAMNCT DREAM The 1st Album Repackage ⠀〖Hello Future〗⠀➫ 2021.06.28 (KST)#NCTDREAM #HelloFuture#NCTDREAM_HelloFuture https://t.co/L4Nfg5G6kWNext up in second place is NCT Dream. While not nearly close to first but still a significant number, the SM Entertainment group has sold 3.8 million copies so far in 2021. In May, the group released their first studio album Hot Sauce and a repackaged album Hello Future in June1) BTS - 6,263,329BTS_official@bts_bighit#BTS #방탄소년단 Butter Concept Photo Sketch@ (weverse.onelink.me/qt3S/e8a4c98a) @ (facebook.com/media/set/?van…)#BTS_Butter #PermissiontoDance10:30 AM · Jul 4, 20211204238330228#BTS #방탄소년단 Butter Concept Photo Sketch@ (weverse.onelink.me/qt3S/e8a4c98a) @ (facebook.com/media/set/?van…)#BTS_Butter #PermissiontoDance https://t.co/Q7VGuag8G6K-pop mega-stars, often compared to The Beatles by global music critics, sit at the top with just one release. Butter was released on May 21, 2021, and was the group's second all-English single. The CD album consisted of BTS' third English single, Permission to Dance, too. In nine months, the group has sold 6.2 million copies.With three more months and multiple comebacks to go in 2021, it'll be interesting to see how the year ends in terms of best-selling K-pop boy groups.