Best Selling Debut Albums by Korean Groups

Quote from MassiveKpopFan

And it's been charting since their debut, not once has it fallen out of the top 100 albums shipped weekly.

not elevator but stairs!

Quote from worldlove27

BTS – 2 Cool 4 SKOOL – 380,768 (Debut Year Sales: 24,441)

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Source of sales: K-Pop Artist Sales @koreansales_twt - Google Sheets
they compile it straight from gaon

Looking at where they are right now!!!

Quote from nakajima-yuto

I was confused why Star sales is low. Then I remember it only has 1 version.

I keep forgetting that tbh. A debut with one version.

Square Up will be #6 by the end of this year at least. I expect it to go double platinum like KTL eventually

I can't believe Dream and 127 barely sold 80k in their debut year (2016) and now they both sell 2M+ per album, they really came such a long way.

The BTS glow up, just love to see it

ATEEZ & SKZ growth

I guess this list counts debut as their fist album released on Gaon, because WayV's debut mini album was actually Take Off but it was only officially released on China and nobody knows how many units it sold exactly.

Quote from worldlove27

Something that I'm adding now:

The albums listed and their 2021 sales (with the year of release of the physical)

1. Wanna One - 1x1 = 1 (To be One) – 2021 sales - 0 (2017 release)
2. X1 – Quantum Leap – 2021 sales - 0 (2019 release)
3. NCT – NCT 2018 Empathy – 2021 sales - 194,048 (2018 release)
4. EXO – MAMA – 2021 sales - 10,403 (2012 release)
5. Enhypen – BORDER: DAY ONE – 2021 sales - 128,947 (2020 release)
6. EXO-SC – What a Life – 2021 sales - 0 (2019 release)
7. BP – Square Up – 2021 sales - 60,368 (2018 release)
8. BTS – 2 Cool 4 SKOOL – 2021 sales - 75,278 (2013 release)
9. TXT – The Dream Chapter: Star – 2021 sales - 50,806 (2019 release)
10. EXO-CBX – Hey Mama! – 2021 sales - 0 (2016 release)
11. NU’EST W – W, HERE – 2021 sales - 0 (2017 release)
12. JYJ – The Beginning – 2021 sales - 0 (2010 release)
13. IZ*ONE – COLOR*IZ – 2021 sales - 0 (2018 release)
14. Treasure – THE FIRST STEP: CHAPTER ONE – 2021 sales - 7,091 (2020 release)
15. RED VELVET IRENE & SEULGI – Monster – 2021 sales - 664 (2020 release)
16. NCT Dream – The First – 2021 sales - 109,573 (2017 release)
17. TWICE – THE STORY BEGINS – 2021 sales - 3,824 (2015 release)
18. GD&TOP – GD&TOP Vol. 1 – 2021 sales - 0 (2010 release)
19. Stray Kids – I am NOT – 2021 sales - 49,582 (2018 release)
20. Busker Busker – Busker Busker 1^st Album – 2021 sales - 0 (2012 release)
21. ITZY – IT’z ICY – 2021 sales - 21,546 (2019 release)
22. SuperM – SuperM – 2021 sales - 15,203 (2019 release)
23. AB6IX – B:COMPLETE – 2021 sales - 0 (2019 release)
24. Girls Generation TTS – Twinkle – 2021 sales - 0 (2012 release)
25. Cravity – SEASON 1 [HIDEOUT: REMEMBER WHO WE ARE] – 2021 sales - 0 (2020 release)
26. NCT127 – NCT #127 – 2021 sales - 19,999 (2016 release)
27. JBJ – FANTASY – 2021 sales - 0 (2017 release)
28. Highlight – CAN YOU FEEL IT? – 2021 sales - 0 (2017 release)
29. ATEEZ – Treasure Ep 1: All To Zero – 2021 sales - 20,082 (2018 release)
30. WayV – Take Over the Moon – 2021 sales - 26,635 (2019 release)

Well NCT debut albums selling the most this year, am I surprised? not really. There are a lot of new fans from 2020/2021 including me.