[Guess Who] Who's That Girl On The Video?!

Hello kpop readers! I miss doing guess who so maybe this one will make its comeback. So, check the video below and guess who is that girl doing gymnastics. To make it hard i won't tell you where she is. Can you guess? But of course i'm not selfish to give you some clues.

CLUE:
She's part of a kpop girl group who is really popular now a days and she is a leader on that girl group.

So, is my clue enough? Can you guess it now? Comment down below and i'll reveal the answer tomorrow.