Guess Who Extended Play (2021) 365k
Checkmate Extended Play (2022) 1.1 million
I'll tell you how. JYP saw IVE and NJ putting up those kinds of numbers and saw that was the new cool thing to sell for girl groups so he made it official. The Unofficial way.
I've never followed album sales but I just randomly looked up Itzy discography and saw this huge increase and need answers.