Answer
I.O.I is not a name Se-jeong has worked under because it is a girl group that she was a part of, not her name. Se-jeong is a South Korean singer and actress who has been active in the entertainment industry since 2012. She was a member of the girl group I.O.I from 2016 to 2017, and has since released several solo albums and starred in a number of television dramas.