Stage Name: Sejeong (세정)
Birth Name: Kim Se-jeong (김세정)
Position: Main Vocalist, Face of the Group
Birthday: August 28, 1996
Zodiac Sign: Virgo
Height: 164 cm
Weight: 48 kg
Blood Type: AB
Nationality: Korean
Time Table: #3
Symbol: Clover
Sub-Unit: SEMINA– Sejeong's motto: Try once more at the last moment : When you feel like this is the last, do it again two more times!
– Her hobbies are: painting and re-watching movies.
– She's a member of I.O.I (rank 2 in Produce 101)
– She was a trainee for 1 year and 11 months.
– She participated in Kpop Star Season 2.
– She debuted as a soloist on 23rd November, 2016 with the lead single "Flower Road"
– Sejeong collabed with Block B's Taeil for the track "She Loves Me, She Loves Me Not".
– Sejeong acted in "School 2017".
– Sejeong will be in a new Netflix variety program "BUSTED", along with Yoo Jay Suk and Lee Kwang Soo and EXO' Sehun.