Su Ji (수지) is a South Korean singer. She was a member of the The Idolmaster KR project group Real Girls Project and the project group UNI.T.
- Stage Name: Su Ji (수지, スジ)
- Birth Name: Lee Su Ji (이수지)
- Birthdate: March 20, 1998
- Birthplace: Daegu, South Korea
- Blood Type: AB
- Height: 164cm
- Weight: 49kg
- Education: Hanlim Arts High School
- Hobbies: Watching movies, listening to music, playing badminton
- Specialties: Dancing, running
- Her former stage name "Halla" means "pull the galaxy."