Kim Se Jeong (김세정) was born on August 28, 1996 (age 19). She is from Jellyfish Entertainment.
Prior to Produce 101 and joining her company, she was a contestant on K-pop Star 2 and also worked as a fitting model. She was a trainee for one year prior to her appearance on Produce 101.She was a trainee for one year prior to her appearance on Produce 101. She ranked 2nd in the show's finale.
She placed second with 525,352 votes in the final round of Produce 101.