| Birth Name | Lee Hyun-seo (이현서) |
| Stage Name | Leeseo (이서) |
| Birthday | February 21, 2007 |
| Nationality | Korean |
| Height | 165 cm |
| Blood Type | O |
| MBTI | ESTP (previously ENFP) |
| Group | IVE |
| Company | STARSHIP Entertainment |
| Position | Lead Dancer, Sub-Vocalist, Visual, Maknae |
| English Name | Sofia Lee |
| Positions | Lead Dancer, Sub-Vocalist, Visual, Maknae |
| Zodiac Sign | Pisces |
| Chinese Zodiac Sign | Pig |
| Representative Emoji | 🐯 (Tiger) |