Gaon recently released an update on physical album sales for Korean albums and here are the 'Top 10 Best Selling K-pop Girl Groups of 2019' so far:
01. TWICE — 612,351
02. BLACKPINK — 336,534
03. Red Velvet — 327,355
04. IZ*ONE — 314,908
05. GFRIEND — 194,434
06. Cosmic Girls — 143,147
07. ITZY — 104,116
08. MAMAMOO — 93,365
09. fromis_9 — 67,106
10. Lovelyz — 54,419
In korea the top 3 are twice, red velvet and blackpink! You hear them everywhere