I see new groups selling a lot but can't even enter top 10 on melon or even chart decently in other charts where it's even more easy... but at the same time they are selling a lot of albums. Usually selling albums it's more difficult then charting nowdays but for kpop idols it's the opposit, male idols in particular.
Monstax, Stray Kids, Treasure or Nct and Seventeen that are selling millions every year but can't chart decently...