In BLACKPINK's killthislove song, jennie is in charge of the tongue sound part of the song. In the classic stage comments, we can also see that it is Jenny who sings the tongue.

Tongue sound is a passive sound driven by the airflow in the mouth, such as the Russian letter р. Don't roll your tongue when you pronounce this sound. Blow your tongue with the airflow exhaled from your mouth, and your tongue will be shocked by the airflow at this time.