- Stage Name: Hayeon (하연)
- Birth Name: Kim Hayeon (김하연)
- Birthdate: August 31, 1998
- Birthplace: Jeollabuk-do, Jeonju, South Korea
- Siblings: Brother (Jiwoon), sister (Taeyeon)
- Education: Jeonju Fine Arts High School
- She debuted on the same day that her sister Taeyeon debuted solo in 2015.