After the end of the first quarter of 2023, HYBE confirms through their investor presentation that BTS Jimin indeed sold 1.45 Million album copies on Day 1 of sale making him the record holder of most sold albums in the first day and week for a K-pop soloist. These updated figures are shocking due to the previously reported first-day sales on Hanteo. On March 24th, Hanteo reported that FACE by Jimin sold 1,021,532 copies on its first day.
Here are the Confirmed first-day sales in the investor presentation, The presentation shows both Jimin’s and bandmate Suga’s first-day sales as well. 
As well as this article published by MusicBusiness Worldwide confirms that Jimin holds the best record for first-day sales by a solo artist.
