| Full Name | Ha Seo-yeon |
| Stage Name | Kelly |
| Native Name | 하서연 |
| Birthday | June 16, 2006 |
| Age | 19 years old |
| Zodiac Sign | Gemini |
| Birthplace | South Korea |
| Height | 5’5″ (165 cm) |
| Weight | – |
| Blood Type | – |
| MBTI | ISTP |
| Education | Seoul Broadcasting High School |
| Languages | Korean, English |
| Group | BADVILLAIN (2024-present) |
| Social Media | – |