- Stage Name: Lia (리아)
- Birth Name: Choi Jisu (최지수)
- Birthdate: July 21, 2000
- Blood Type: AB
- Height: 168cm
- Weight: 47kg
- Education: Seoul School of Performing Arts (Graduate)
- She is a former SM Entertainment trainee.
- She received vocal training at Dream Vocal Academy.
- Her stage name comes from her English name "Julia", which her aunt gave to her.
- She used to live in Canada.
- She can speak English.