| Full Name | Seo Da-hyun |
| Stage Name | DaHyun |
| Native Name | 서다현 |
| Birthday | January 8, 2003 |
| Age | 22 years and 5 months old |
| Zodiac Sign | Capricorn |
| Birthplace | Gwangan-dong, Suyeong-gu, Busan, South Korea |
| Height | 5’3″ (160 cm) |
| Weight | – |
| Blood Type | A |
| MBTI | ISFP |
| Education | Hanlim Multi Art School |
| Languages | Korean, Japanese, English |
| Group | TripleS |
| Social Media | – |