It's mostly old releases since only WayV mini and Dream's Hot Sauce and the repack are 2021 releases
Full nct list:
1. Nct Dream - Hot sauce - 2,049,042
6. Nct Dream - Hello Future - 869k
12. Nct 2020 - Resonance pt 2 - 492k
15. Wayv - Kick Back - 361k
25. Nct 2018 - Empathy - 194k
28. Nct Dream - We Boom - 172k
42. Nct 127 - Neo Zone - 119k
49. Nct Dream - The First - 109k
66. Nct Dream - We Go Up - 84k
68. Nct 127 - Neo Zone: the final round - 80k
69. Nct 127 - We Are Superhuman - 80k
71. Nct Dream - Reload - 71k
Total: more than 4.6M copies sold this year only counting the top 100 available from gaon chart
NCT dominating the mid-year chart, can't wait to see the final numbers and rankings by the end of 2021, I'm sure it will be full of nct albums
+ Queen empathy, released in 2018, selling almost 200k this year... We love to see it