- Stage Name: Sumin (수민)
- Real Name: Park Sumin (박수민)
- Position: Main Rapper, Main Dancer, Vocalist, Visual, Center
- Birthday: September 7, 2001
- Zodiac Sign: Virgo
- Height: 166 cm (5’5″)
- Weight: 46 kg (101 lbs)
-Her special talent is rapping
-Sumin can mimic the sound of an elephant.
-She had wanted to host a Christmas party at the dorms for their first Christmas together since debut
-Sumin wants to take her mother shopping with her first paycheck
-Her role model is IU
-Sumin was a contestant on MixNine (Rank 3)
-Sumin pays in a web drama called 게임을 맛보는 남자 (“The Man Who Tastes The Game”).
-Sumin, Lara and Youi share a room.